Can I apply for the DTV from my home country if I’m not actually located there?

I am from the US and have been in Thailand for a few months now, planning to apply for the digital nomad DTV. I was going to do it from Laos and use a parent sponsorship but learned that Asian countries don’t take parent sponsorship letters. My parents transferred money into my account but only a few weeks ago.

I’m hearing that the DTV may get cancelled or the requirements may change, so I’d like to apply sooner than later. Can I leave Thailand (go to Hanoi for example) and put my location as my residence in the US and apply from the US embassy in DC?

Additionally, does anyone have a definitive answer on if the Hanoi embassy has a seasoning requirement for the 500,000 baht?

Thank you in advance!