I think they are just a hypernationalistic Cambodian, Khmer American, or a former expat in Cambodia. I saw content from similar types of accounts during the Thailand-Cambodia conflict and the Techo Canal crisis.
But yea, it's stupid tbh and shows how badly Hun Sen is wreaking Cambodia.
The only reason Vietnam is where it's at today is because of being friendly to foreign investors and working on rooting out criminalization in the 2010s. Otherwise, VN would have languished. Cambodia has the right pieces to become the next VN, but is completely squandering the opportunity.
This kind of ploy to leveraging hypernationalism to mask weak economic growth (an LDC like Cambodia should not be growing at 5-6%) and increased isolation.
https://news.ycombinator.com/newsguidelines.html