Would replacing all spark plugs and bad ignition coil cause another coil to fail

No , it was probably weak to start with .OR he switch those two coils and put new plugs in and waited to see if the coil really was bad (misfire follows coil position). But the latter part is somewhat unlikely.

I have had 5 of 6 ignition coils replaced in my 2010 Acadia over time. After #3 it was hard for GMC to not cover the 4th & 5th after warranty was out. Currently the car is exhibiting similar issues which could mean #6 (or one of the replacement coils ) is getting weak. I agree that one individual coil going bad probably has no effect on the other coils.