Interpretation...is it valid critique?

[milo]

'Objectivity' is just another way we flatter ourselves;
it's a delusion created by our hubris.

This reminds me of another funny cliché "everything is subjective"

Really? If that is true than nothing is subjective, as the word only exists to describe a state.

Yes, the statement "everything is subjective" is ambiguous.
A better way of stating it would be: "All perceptions are subjective."
A tree, a rock, or that spider under your chair are definitely
not subjective. It's our perceptions of them that are.

"Subjective" and "objective" don't usually describe states.
Of course they can:

"Oswald the duck was feeling especially subjective today.
Yesterday, when he looked at the wheelbarrow, it was red.
Today, it definitely seemed communist."

The statement isn't ambiguous, it's wrong. The artist's responsibility is to challenge cliches. That and to laugh as others desperately cling to them. Then again, my heart isn't at home either.