I mean that he is “Yeshivish” in terms of his hashkafa. Really “modern Chareidi” would be a better term, but in the US, they don’t use the term Chareidi.
Depending how people use the term “Yeshivish”, some would call him Yeshivish and some wouldn’t. I find that people from Brooklyn often seem to use the term this way, but most people I know from Lakewood would not call this person “Yeshivish.”
My super-Frum friend from Teaneck who considers herself Modern Orthodox would call him Yeshivish (even though he’s less Frum and way more involved in the secular world than she is) because he’s not tzioni, believes in Kollel as a value, and says “Shabbos” instead of “Shabbat”.
Basically, it depends if you are using the term Yeshivish to refer to religious level, hashkafa, or sociology (all of which are legitimate and widely-used definitions).
With apologies to Meno :).