Yes, I know it's just a "retro looking computer" to frame a YouTube video but...

I had to look up the Tandy 1000 RSX, because it seemed very wrong to have 16-color VGA graphics coming out of a computer labeled as "Tandy 1000".

Tandy 1000 RSX was the last model from 1991, and it had Super VGA rather than the famous "Tandy graphics" that originated with the IBM PCJr. It did not come with an Adlib or Sound Blaster card, which is what was depicted in the YouTube video. But the computer did have one ISA slot, and an Adlib or Sound Blaster compatible card could have been installed.

It also had a 386 processor rather than the 286 normally found on Tandy 1000 computers, and 1MB of RAM.