Fair enough. That does sound like they are legit sites, and abiding by the current laws.
I've seen a number of different vendors stating things along the lines of 'it is the users responsibility to check the legal status of any substances they are seeking to import into their country, and we take no responsibility for any potential legal consequences if any substances are not legal in the destination country.'
Those kind of disclaimers were just a waste of space imo, for a start they would have been exporting banned substances, which surely must be illegal. And if enough banned substances get seized by Border control agencies, all seeming to originate from the same vendor, it won't be long before the vendor gets investigated, and action gets taken against them.
So obviously they'd want to avoid that kind of legal 'heat'.
There was a well known Spanish vendor who did continue to ship banned high purity RC substances to the UK for a year or 2 after their ban. I cant recall the exact time scales now, but this vendor had an incredibly clever stealth postage method, and that's possibly why they carried on, and got away with it for some time.
Who knows if they eventually quit while they were still ahead, or if they got caught. I certainly don't.