Looks like laid up.
Announced 7/2013 intention to retire this pair, PHUTTHAYOTFA CHULALOK in 2015, and PHUTTHALOETLA NAPHALAI in 2017
https://www.pressreader.com/thailand/bangkok-post/20130730/281565173381861

Well,,alwayshard if Navy ships are really laid up,, I see often in VEN,, no movement for 2-3 month and suddenly they move again. Same in the US, on the Mississippi River, at least 6 Navy ships from the Marine Lift Command,, but every 6 weeks they go out of the river,,make trials and come back in,,and the only way to see that is when one passes the ships at theire berth that suddenly the outer one is now the inner one.

I heard they are laid up, I passzd there this month and they are in just the same place

Chulalok was formerly USS Truett (FF1095), Naphalai was formerly USS Ouellet (FF1077).