Then why doesn’t he say that? Or why doesn’t he endorse trump? Why won’t he say why he won’t?
Same reason no one else, Republican or Democrat, has declared either way yet.
Trump only declared ridiculously early because he's worried about being indicted, and believes it gives him some protection, which it probably does.
But that doesn't mean the schedule of everyone else on earth was suddenly adjusted to match Trump's desperate change. The universe does not rotate around Trump, an obvious truth many of his supporters have trouble understanding.