score:1
The Thai MFA regulation technically says POOT must be an air ticket (Evidence of travel from Thailand (
air ticket
paid in full)
). You could try other forms of POOT.
ThaiEmbassy.org is not an official site, despite their obvious attempt to make it appear so.
BTW if you are passing through Malaysia, Penang would be the better Thai Consulate overall for just about any visa (unless you want to go to Kota Bharu). Not sure if they are still asking for air POOT. Again, you can present your [land/boat] POOT and if needed, just get an air POOT to a neighbor country. Cambodia (Phnom Penh) is similar. Especially if you use an agent, then a few extra $$ might make application process smoother. KL Thai Embassy is more of a hit/miss with emphasis on miss if you are not a Malaysian resident.