So the CDC came out and issued a new Eviction Moratorium which postpones evictions for another 60 days due to Covid and the Delta variant.

With the pandemic and social distancing, I know some meet-ups have either been postponed or switched to virtual.

It sounds like you MAY have been postponing a (legal) confrontation with some tenants due to fear.  

Also, evictions are postponed only if victims are directly affected by coronavirus and can prove it I'm not sure if rent increases are included in this.You were lucky to find a 4-unit with mtm tenants most people deliver with long term tenants that are freshly signed leases making it hard for fha or other owner occupied loans...

However, this year the event has been postponed until June.Usually brokers use NMHC as an opportunity to roll out their deals for Q1 to get in front of as many buyers as possible.

My friend has asked the seller to fix the issue, and sent an amendment postponing the closing date. 

If they are in a specified time of lease then I believe some lenders can postpone your occupancy requirement until one of the leases are up.

Can we postpone the signing of the lease until I get in town since I am not actually taking possession?

If you don't do everything right you will keep postponing the eviction costing you more money.

Are you writing the rehab credit in the contract or is this handled with a separate document like a repair escrow for postponed improvements?