Aww... poor little guy.

But lovely lettering Joi! Love that capital T and your x!

I'm going to quote from the other thread because otherwise, I'll mess it up and this was a perfect summary...
From FrenchBlue Joy:
It makes more sense to see how the terms get muddled when we take for granted that we're talking about all pointed pen styles! In fact English Roundhand is not a pointed pen style at all-- it was written with a thin and flexible, but squared-off quill.
The look of the script changed and evolved over many many years, especially also when pointed tips began to be used. The term "Copperplate script" used to refer to the calligraphy itself (and not simply the reproduction method) was not used until the 1930s!! By then it appeared in a compendium called "The English Writing-Masters and Their Copy-Books 1570-1800". So already it has to be clear-- there is a lot of change an evolution which happened during those years.
Over time the look of the script changed quite a lot. Because of the smoothing "photoshop" effects that were possible through the engraving process (like you mentioned, Estefa), and the adoption of pointed pens, and many other style changes along the way, there actually developed a style of script which tried to emulate those perfect engravings. The script was definitely based on English Roundhand, but featured a more elliptical oval work with enough difference in terms of slant and high ligatures (which kind of spring up quickly and more steeply) , that these styles began to be called "Engraver's Script" and "Engrosser's Script", both also called "Copperplate Script".
Unlike Roundhand, they were definitely not a handwriting style, written swiftly. They are formed very slowly and carefully. The progenitor hand for Engrosser's, Engraver's, and Copperplate script IS Roundhand, which confusingly is also called "Copperplate"... though it wasn't called that at all in its own day. This gets confusing, right? This is why sometimes the term "copperplate calligraphy" is avoided altogether. It is simply easier to speak about English Roundhand and Engrosser's or Engraver's scripts to be different things completely. Or just accept that they can both be called Copperplate, but it will make conversations like this one a bit muddled!
Hopefully it's clear that when people say "Copperplate Script", they are not always talking about the same thing! This history of this script begins with English Roundhand --> Gets engraved onto "Copper Plates" --> Begins to inspire calligraphers by the perfection of the engraving process --> Influences changes to the script as its written on the paper --> Brings about an innovation in the style and the type of quill point --> Begins to be called "Copperplate Script" in its own right. Equally called Engraver's and Engrosser's Script.
What is taught these days as Copperplate usually more closely resembles Engrosser's than Roundhand, because of the way the ligatures sit on the baseline. Roundhand is, effectively, more "round". The spacing between the letters is different. Engrosser's script looks like it's sucking in its belly, by contrast! And incidentally, this style is more what leads into Spencerian and other rapid business scripts, later, which favor the steep ligatures.