The paper card was discontinued (airports) for several years. They reintroduced it electronically, several weeks ago. It is an arrival card, so only filled for people currently entering the country. Since you are already in the county, you do not need to fill it out. However, you will do so, when you enter again.
TDAC is the same as the old paper-based arrival card. All foreigners entering Thailand must complete it, within 3 days of arrival, including DTV holders. It has nothing to do with “re”-entry.
all Cambodian - Thai borders are closed. Things are only escalating day by day, so this will be awhile. Cambodia has banned all Thai TV shows and movies, cut electricity and oil coming from Thailand and all other Thai imports.