“They could have simply stated that non-JWs (whatever their status) could theoretically believe/repent and get saved after seeing proof that the WTS had been right all along (which even has legitimate Biblical precedents, “
This is what they basically said without putting so bluntly. They said in other words it’s ok to wait until the great tribulation starts then start to believe.
As has been said on Reddit you don’t want to waste time sitting on the ark when the flood may not come for a long time or may not come at all.
Br Jackson said the door of opportunity will be open until after the great tribulation clearly starts.
Most people are thinking like me, I don’t think the world will flood (or events JW predict) so why waste time sitting on the ark why not get on with your life now.
If we got it wrong and the events do start to happen like JWs say then the door is still open.