i dont really understand what the NG+ reload glitch is

It basically is a glitch where you can start a new game and it will still load the last save file. It's not really a glitch that can happen on accident, so you should be OK. It's not allowed because you could theoretically get sub 2 minute times.

man its been 6 days and my speedrun still isnt accepted

ikr I posted mine 1 and a half weeks ago.