Hahaha, thanks Ron for the shoutout
Unfortunately I haven't done much with SSTCs either. I have really only made SGTCs in the past. From what I gather, however, this is not actually a Tesla coil. Don't quote me on this, but at first glance, this only seems like an over-complicated version of coil driver. I posted the basic design below.
**broken link removed**
(You'll notice in the link that they call it a "Single transistor solid state Tesla coil", which of course is ridiculous)
This is actually the type of thing that really grinds my gears. Some people create a coil driver (whether it be ignition coil, flyback, etc) and automatically say "Oh hey, I must have made a Tesla coil because it sparks!" I'm sure you know by now, Lokey, that this couldn't be further from the truth. Tesla's actual coils operate through resonance, whereas ignition coils and flybacks operate by forming and collapsing an electromagnetic field. The one you show above does not seem much different. Granted, it does not have a ferromagnetic core, so it is not quite the same as a flyback or ignition coil, but overall I think it runs the same way. I'm sure there are members here more qualified to talk to you about the circuit itself, and whether it really is a Tesla coil or not. But to me, at first glance, I am inclined to say no, it's not.
Do you have a link to the website on which it is featured? I'd be interested to take a look at it.
Regards,
Der Strom