I am not sure where is our rights protected if we sign the update.
The amended terms of your EXISTING written lease have nothing to do with your rights.
If you AGREE to the amended terms of the lease by signing same, that is your choice.
You aren't legally required to agree to any of the lease terms, unless you CHOOSE to do so.
However, if you choose NOT to agree, I suspect the landlord MIGHT exercise her/his right to NOT renew the lease as the end term approaches.
However, you survived the prior Covid contingencies quite well, and I suspect you'll do the same this time.
The landlord appears to be anticipating more losses under Covid, and is trying to get tenants to agree NOT to use any rights granted to them via governmental laws or declared fiats.
Fortunately for you, if you choose to agree and the laws or politician decrees say otherwise (as they did recently), you could freely choose to enjoy any benefits granted pursuant to the then existing governmental decrees or laws.
The landlord is overthinking it, and his/her coercion would be deemed meaningless by virtue of the then existing laws/decrees.
Heck, I'd sign the darn thing to avoid any flack that MIGHT come my way down the pike.
What you decide is entirely up to you.
I wish you good health, safety, and success.