When it says purgeable, I am confident it can be purged. The worry is that purging may affect your system performance in the general sense. For example, lose TM snapshots (if using TM), lose caches and cloud data which effects response performance when needed again, probably (I have not checked) some logs. So I would avoid the situation where data needs to be purged. But your system has plenty of free space - great!I worry that what macOS thinks is purgeable might not be.
Over the years there are repeated complaints regarding free space and its inconsistency. I think Sequoia went a little way to improving that.