Regarding your points:
It makes no practical difference if the Tur does or does not bring that Maharal. He doesn’t rule against the Maharal. And we still know very clearly, from poskim throughout the ages and from the terrible instances of destruction of Jews like harugei beithar, that the three oaths are G-d’s will and very much in effect.
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It makes a HUGE practical difference whether maharal is CONTRADICTED by tur , sh’a and nosei keilim.
In all areas of halacha , in all Jewish communities , during all generations , we knew that halacha is like those poskim – tur , sh’a and nosei keilim.
Satmar , and katan is mindlessly repeating here, seem to hold opposite.
Tur , sh’a and nosei keilim in YD 156 are clearly CONTRADICTING maharal . They clearly state that that all mitsvot besides for the three hamurot , including the oaths , is yaavor veal yiehareig.
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Besides that, there is another important point- maharal is NOT talking about defending an existing malhut.
Maharal talks about CREATING a malhut.
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