The Oaths were the core of the opposition to creating a Jewish State by all the Gedolim, not only Satmar. Rav Samson Raphael Hirsch speaks about them extensively regarding his oppostition to Zionism in Chorev, the Lubavitcher Rebbe (Rashab) mentions says so, too, in his famous letter in Daas HaRabanim. Reb Elchonon Wasserman brings them in his Ikvesa D’Meshichah, and Rav Shach and the Steipler make mention of this as well in their letters.
Other Gedolim have said the same thing as well. In the famous letter of the Rebeb Rashab of Lubavitch about the Zionists, he writes clearly that even if they would all be nice religious Jews, it woudl not change anything. Their being heretics is emphasized because thats easy enough to see and understand even withotu any great Torah knowledge, and it is uncontrovertable even by the most confusing and confused Zionist. Its black and white.
The material there almost duplicates the Daas of the other Gedolim on all the core issues, such as, the prohibition of creating a State before moshiach comes, the violation of the Oaths etc. The disagreement between Satmar and other Gedolim are only on minor issues such as voting in the elections, being part of the government and taking money from them. And even in those issues, there is no unanimity among the authorities even outside Satmar.