Is it possible to do a border run to Cambodia with a Dtv given the current land border closures?

Forget about Cambodia.

The borders might be closed until mid 2026 or even permanently.

You can travel to Cambodia by land if you so wish, via Laos. However, due to anti-Thai sentiment, I wouldn't count on a Thai vehicle being permitted to enter Cambodia from Laos, though there are cross-border buses operating between Pakse and Siem Reap as well as Pakse and Phnom Penh.

Otherwise, you can fly...although many airlines have reduced their flights between Bangkok and Cambodia since July.