Lol you realise this happens all the time in far bigger comps than the NRL? European soccer pitches have some variation in them- certainly more than what’s described there.
If it’s a choice between a state of the art stadium with a slightly non regulation pitch vs some crap 3rd tier venue with regulation dimensions you’d take the good stadium every time.
I've seen plenty of Rugby League played on soccer fields in England - and the smaller fields significantly impact the game. The RLWC Final at Old Trafford last year was a disgrace, and it's a very similar size to Allegient Stadium (if the above specs are correct).
One of great things about Rugby League is how the players attack the ball when it's close to the dead ball line and sideline - or the leaping tries in the corners. You lose all of this if players are at risk of crashing into a barricade at speed. Let's all remember Luke Lewis doing his shoulder over there sliding into the fence and losing 80% of the following season.
If they can push the bowl back so we get a full sized field, at least 7m in-goals and a safe distance between the field and the nearest hard surface I'm happy. Otherwise I'd be happy for my team to send a bunch of reserve graders.