Why put out shitty pre-alpha footage if you don't want people to point out how it looks shitty?
Besides plenty of games get released looking just as shit as their pre-alphas did. Not final might means it will actually look worse on release. This has happened before, pre alphas demoed on super PC which it turns out nobody has and final release has lower res textures, geometry, lighting, etc.
Your "Its not final" dance is that of a fan boy, not of a realistic viewer of this video and absorber of what it is supposed to mean. They are showing it to show off, and it is not overly impressive.
Shit guitarist? No guitar solo kthanks!