Without knowing the content of the agreement its impossible to state, but it is generally placed into an agreement that the terms can be changed and it usually explains the terms of that change with regards notice.
I would suggest taking the agreement to your legal peeps for advice,but you should have known what your rights are and that of the landlord before signing an agreement, if you did not know you should not have signed.
Courts don’t take pity once you have agreed and signed, to later claim you didn’t know either party could change the terms or impose clauses would not look good or stand up in court, a judge once told me naivity has no defence in law.
Having read the clause I would suggest that imposing a time restriction on using a community facility was harsh, but also beware the alternative may be your landlord giving you notice to leave.