Rabbi Adlerstein’s original multi-page Jewish Action article on frumteens is available online as a PDF. It is clearly effusive in lavishing high praise on both the frumteens site and the work and success of the rabbi behind the site in helping Jewish teenagers, via the site, in remaining frum.
Sure Rabbi Adlerstein mentions in the article that many readers of the OU magazine will greatly disagree with the sites strong position against Zionism and its criticism of Modern Orthodoxy. And after the article was published RYA felt the strong heat from the farbrente Zionist clientele of the OU magazine’s subscribers in letters to the editor that were openly bitter that RYA dared to lavish such high praise upon RYS, despite his highly admirable and undisputed success in saving Jewish lives — as documented in detail in the Jewish Action article — since RYS was outspoken in his writings against Zionism and MO leaders. And for this clientele, Zionism was the greatest form of their religion. Speaking against Zionism was heresy to them and wiped out even saving lives.
With the intensity of that heat RYA indeed wrote a letter in a following issue apologizing for not further making clear he certainly doesn’t agree with RYS’s positions on Zionism and Modem Orthodoxy and their leaders. But even then he still acknowledged the article itself was entirely accurate in describing the many young Jewish lives saved by RYS through frumteens.
Whether RYA describes himself as Chareidi, MO or anything else, even a cursory reading of his many writings in cross currents and elsewhere makes abundantly clear that his underlying hashkafas, and not just his endearment to Zionism but his overall views and take on religious events, is far closer to Modern Orthodoxy than to Chareidi. His site partner Rabbi Yaakov Menken is a bit more to RYA’s right and RYM could be better described (in his worldviews) as Chareidi-light.