Did Apple remove Parler from iPhone’s safari?
UPDATE ::: A comment from Denis below found that if a domains A record is set to 0.0.0.0, safari on iPhone performs the same way. So it isn't that they blocked the entering of the domain in the URL, it is just a DNS error. I have never had this happen before, but I have also never set a domains DNS to 0.0.0.0....
From what I can tell and I tested on a couple of iPhones, Apple has removed the word parler.com from being able to be typed into the address bar of safari on the iPhone. Please let me know if it works on your phones. It must be a recent update or they are able to control it another way.