I also get the “Hmm…this page doesn’t exist” message. Musk is twatting about with twitter, sorry - X, so much these days that things break all the time.
Safest thing to do with tweets is to screencap them and upload here. If it’s a picture, save it and upload here. If it’s a video sample, use something like [Login to see the link] and save the highest resolution listed then upload it here.
