I was curious so I took a quick look at the blog posting... and I have to say it's more misleading than informative.
In "the really old days" RCA connectors were not considered to be a big deal at all.
Back in those days the RCA jacks on even really high-end gear were often mounted on little strips of brown phenolic plastic.
(They were zinc plated, tended to oxidize quite badly, and broke easily... they were also usually connected to the circuitry inside using actual wires.)
Today there are basically two main types of RCA jacks you will find on gear.
The "regular kind" are a vastly improved version of those original connectors.
The metal parts of the connector now are usually either nickel or gold plated...
And the plastic they are held by is a more modern and much stronger material...
Most modern jacks of this sort are also "PCB mounted"...
One or more jacks is attached to a plastic block; the connections go through the block; and end in pins that are soldered to a circuit board.
The robustness of these connectors varies but they're actually quite reliable under normal use.
However, because they are generally soldered to a PCB, and are made of flexible plastic, they are somewhat easily damaged by having excessive force applied to them.
(That's a fancy way of saying that, if you pull hard enough, or hang really heavy cables on them, they can come apart, or rip loose from the board they're soldered to.)
What we now generally refer to as "Tiffany style connectors" are separate machined metal connectors.
(The name "Tiffany" was originally the product name for a particular brand of connector of this sort... now it's used for any connector of this type.)
With a "Tiffany style" connector the metal body of the connector is attached directly to the chassis.
It has threads, which extend through the chassis, and you then fasten it by putting a nut on the threads, much like a bolt and nut.
(There are variations; some with the bolt head on the inside, and the nut on the outside; and some with a sort of nut on the outside, and the removable nut on the inside.)
However, with both, the body of the connector is solid metal, and so very robust, and extremely resistant to being pulled or having heavy cables hung on it.
What the article was talking about was really sort of incidental to all of this...
With PCB mounted connectors there is usually no direct metal-to-metal connection between the connector and the chassis.
With Tiffany style connectors the outside shield on the RCA jack itself is generally one piece with the outside threaded portion of the connector.
This means that, if you attach one directly to a metal chassis, the "jack ground" for the RCA connector is attached directly to the chassis.
This may be desirable or not depending on your design...
If it IS desirable to have then connected you have to make sure that there is bare metal exposed on the chassis or include some sort of "star washer" to make solid contact.
If it is NOT desirable then, as the article mentions, you would include some combination of insulated "shoulder washers" to insulate the jack from the chassis.
(You will often see an arrangement where insulators are used... and a lug is mounted on the jack which is then used to attach a ground wire.)
In general, Tiffany style connectors cost a bit more as a part, and require more labor to install.
(Over the years they have progressed from being an expensive premium part to being a commodity item.)
They also take up more space when you take mounting clearances into account.
In return they are much more difficult to break...
And, in some situations, they
MAY also be easier to service...
