NLF is a flawed and made up term.
Like Freed creating runes that could stop Makorov back in Fairy Tail Festival where he made that rune to trap him in that place with natsu... Now Makarov was much stronger than Freed right? How was Makarov effected by the runes then?
Weaker magic can totally work on stronger mages
Macro should be able to effect Jellal.
Anyone can easily just say that Jella's magic cant work on demons because it hasnt been shown to effect demons lol see the problem with NLF? Its a 0 win arguement.
NLF is made up just like everything in fiction, surprise surprise.
No one is saying that weaker magic can't work on stronger Mages, just that we shouldn't assume that it has no limit especially when it would be ridiculous if it didn't. P.S. the runes by the Magic Council were stated to be stronger than Freed's which means that Freed's do indeed have a limit that is based on his strength (because it would be impossible for the Magic Council's to be stronger if Freed's had no limit). No limit fallacy is used to stop absurd claims such as Macro working on Acnologia. Macro can work up to around the level it has shown it is capable of (Tartarus Erza) or Macro can gain complete control of Acnologia and Zeref, which is more reasonable to assume? When you operate on the assumption that nothing has a limit because there has been none shown you would have things like Silver being insta-freeze (what he did to Natsu) people like Zeref and Acnologia.
It's shown that Macro works against humans, demons and objects. Since there are no limits shown up to now, no one can say it doesn't work against every human. Again, this is nothing more than a biased excuse.
You think it works against Demons? You serious? Why do you think that Mirajane was able to resist it? It was explicitly stated that it didn't work against demons...
Now let me show you the flaw in your logic:
It's been shown that Zeref's death magic instantly kills everything, since there is no limits up until now, no one can say that he can't one shot Acnologia.
It's been shown that Fairy Law can one-shot people, since there is no limits up until now, no one can say that it can't one shot Acnologia.
It's shown that Brandish's size manipulation magic works against humans and objects. Since there are no limits shown up to now, no one can say it doesn't work against every human. No one can say that it can't shrink Zeref and Acnologia to the size of a rat.
Midnight's Refractor hasn't shown any limits on what magic it can refract up until now, it can reflect Acnologia's full strength roar.
See why this logic is flawed?