No, you are not being censored.
New comments are not allowed on threads more than 1 month old. The thread you were trying to comment on is 3 months old.
This is to preserve space on the blockchain -- leaving all threads open to new comments indefinitely just wouldnt work (though i suspect at some point there will be a way to make some threads endure longer)
that said, upvoted because its a valid question and others might also be confused.
okay thanks for explaining that part but I am still unable to post from my home computer.
Great answer! I was curious about this myself and you cleared it up nicely.