The aluminum version would be preferred, but what you linked will do just fine. I can’t find a small tin of the aluminum version on Amazon, so don’t bother overspending on a large container.
If you are going up a thread size, make sure you get the appropriate drill bit. You need to drill out the hole before tapping. M5 usually calls for a 4.2mm predrill.
A smart tv without an internet connection is usually close enough to a dumb TV. It’s not like your TV needs regular security updates so leaving it off your home network is fine.