Can Minecraft speedrun be in non-premium?

?

By 'non-premium' do you mean cracked/pirated?

I mean shiginima launcher or tlauncher

No because in the rules is written donw : Use an official release of the game. No alpha, beta, snapshots, etc.

yes, why not? Its not alpha, beta or snapshot. Its official release of the game

This has been discussed multiple times. If you want to speedrun Minecraft but dont have money, then you can do Any% Glitchless (Demo)

I am asked Ollie once, he said it is acceptable.