On a related note:
Rabbi Herschel Shachter, in a Yom HaAtzamos address (posted online) a couple of years ago mentioned how the Brisker Rav asked his daughter and son-in-law to move back to Eretz Yisrael from America. To which RHS remarked, “Sounds like a Zionist to me”. Of course, the Brisker Rav was very much not a Zionist; quite the opposite as, presumably, RHS knows quite well.
As RHS, himself, noted in that same address, RHS’s own “psak” is that if someone would learn better, shiurim, etc. outside E”Y, versus if he were to move to E”Y, then he should NOT move to E”Y and stay where he is.
Obviously, then, the Brisker Rav recalling his kids to live in E”Y had to do with their particular reasons and nothing to do with Zionism of any flavor, CH”V.
I won’t speculate as to why RHS conflated the issue of Zionism with an objective decision of when to or not to live in E”Y especially given his own view on the matter stated in that same address. But the Brisker Rav was obviously not a Zionist and that same Brisker Rav said that Zionism is A”Z among other things.