LTR Work from Thailand Professional is a much better visa if you qualify for it. You need to be employed by a public company or private company with $150m in revenue, though, if you aren't, you don't qualify. If you are, and can get written confirmation of that, you should be able to get it, that's really the key sticking point. Income requirement is only $40k/year if you have a masters, $80k otherwise.
the MFA has officially announced this, it's not just random websites. We need to see the ultimate details and requirements, but this is direct from the MFA:
the requirements aren't out yet so we don't know what they are. It's certainly not out of the question she'd qualify, the targeted groups seem quite broad, and if so it would be the obvious visa. Should be launched before she comes here so she'll know either way.
local immigration office won't be able to give him any advice on a visa run. They may say he can't, or may say he can, or may decline to say anything but whatever they say it will have zero bearing on what actually happens. He's not applying for entry to the country at his local immigration office.