> Kantianism is not the predominant view among working metaphysicians today

Which gladly nobody claimed to be the case. "At least since Kant" gives us a time frame not a causal link — and even if it did pretend there was a causal link, any philosopher wouldn't have to be a Kantian in order to agree to a thing Kant said about Plato's concept. Or phrased differently: A Non-Kantian can agree with Kant on a thing Kant said about Plato without suddenly becoming a Kantian.

What the poster said here is to my knowledge correct (I studied philosophy).

... but he doesn't say a majority of philosophers believe in Kant. He just says the view of the forms has been different since Kant's time

> At least since Kant, the general consensus in Philosophy about Plato's "forms" or ideal objects is that they are conceptual objects.

Repasting the quote without addressing the response does not do much to bolster your position - perhaps the opposite!