Okay, so the translations are a little off - looks to be machine translated at parts or too literal rather than conveying context and meaning - but close enough so people will get the gist of it.
As for the last two chapters. The professional chef doesn't really have too big a vested interest in beating our MC because our MC is literally a nobody. That he can already cook to a tie in two rounds kind of already puts you to shame and even if you beat him - he does it as a hobby, so you're not exactly going to get a great deal of credit for beating someone who doesn't do it professionally. I guess he doesn't want to lose, but he's tryharding too much. His super serious stuff is going to lose to the more appealing easy-going stuff, obviously. Pretty typical progression.