Yes, they can deny that the facilities were destroyed. The satellite imagery released wasn’t detailed enough to reveal the extent of damage beneath the mountains. So in reality, denial remains a viable option.
While you may believe the U.S. or Israel wouldn’t go to such lengths to strike Iran again, I wouldn’t take that chance. That kind of assumption is like thinking lightning won’t strike the same place twice that’s not a mindset you can afford to have. You need to prepare for all possible outcomes, not cling to hopeful speculation.
As I’ve already mentioned, doubts about Iran’s intentions will persist. Regardless, Iran is likely to continue enriching uranium covertly and yes they should. At this point, it’s a race between Iran testing a nuclear device first, and Israel/U.S. striking again on their nuclear facilities.