What you're saying is non-sequitur, or you're missing the point.
1. Cave Story and pretty much every other homebrew/indie/ROMhack TASes have minutes and hours of tool-assisted
gameplay. Gameplay that is
entertaining.
Here we see a couple seconds of gameplay and a result of otherwise invisible luck manipulation. And the bit of gameplay that we see isn't anything special either.
2. King's Bounty TAS had a fun and novelty factor of a long and complex game beaten instantly thanks to extreme luck manipulation, as well as the subtle humor in subtitles used by the encoder (I think it was Maza; he wrote "This was a tool-assisted speedrun" in subtitles as they came onto the screen already after the last input). And the next version of the TAS actually brute-forced the sequence, essentially rendering it unimprovable, which can't be said about any other luck manipulation-based TAS here.
Syobon Action doesn't have that factor, and the nature of its "glitch" actually makes it more convenient to execute.
3. As this game is homebrew and free, it can't be assumed that it went through quality assurance typical commercial of games of the last 20 years. This makes the "glitch" showcased here about inherently less impressive; for me it's closer to accessing a debug menu in the beginning of Genesis
Ninja Gaiden.
For the record, I voted "meh" rather than "no" only because I can see merit in the last couple seconds as well as the possibility of even better manipulation, but really I don't care either way.