It's a general statement, not meant to be backed by evidence, that encapsulates how difficult it is to hit Biden on this when what the administration is doing (ie. Supplying weapons to Ukraine while staying out of the war) is where 80+% of the population is on this question.
That's the frustrating thing to me... I will say that criticisms about, say, not providing MiGs seem fair to me. Even if one disagrees or thinks that it risks a wider conflict.
Just saying "Biden is weak because, of course, Biden is weak" is... a pretty weak argument.