Did you ever use the suppressors and would there be evidence of that on them?
He could have used them in a place where they are legal to use or bought them used so evidence of past use is not dispositive.
Did you ever tell the guys you were speaking with you had planned to use them/ had fired them?
I would hope that he didn't, but I believe his lawyer's advice would be to not answer these types of questions in a public forum. It does not advance his cause at all.
If he never mentioned that kind of thing, it means nothing about what he had done or was going to do. It doesn't exonerate him.
And if he did mention something of the sort, it's damning.