100% she is wrong.. EVERY entry class must do TM47 reports (PR isnt an entry class) the only difference is some of the BOI ones do them annually not 90 day, which is why 90 day reporting is a poor way to describe them now.
Every entry class must do them, without exception. Of course if you have no interaction with immigration and leave at day 179 then there isnt a mechanism to catch you but thats not the same as not needing to. If extensions become possible, that is when it would be caught. There is no exception to TM47s on any class of entry in the entire visa system.
I recently did my TM47 on my DTV, as I had to.. All accepted and normal.
As to the extensions.. HQ in bangkok will not clarify that it will be possible, so she is saying something with confidence, that HQ is refusing to say.
Your advice was wrong, unsure if that was a badly informed IO or the inability to explain directly in english and via your partner.
100% for sure you DO have to do 90 day reports, TM47.. Perhaps they confused what you are asking as you are so early.
Its interesting that they gave you extension advice considering the complete refusal to answer that from HQ in bangkok or other regional centers like Chiang Mai / Pattaya / Phuket etc. Its not likely that a local office like nakhon sawan would be ahead of the curve on information like this. Its much more likely they made it up on the spot (not that I dont think showing bank funds would be part of it).
No.. The DTV allows remote work only, working in any capacity for a Thai business is not exempted for work permits and the DTV does not support obtaining a work permit.
To be 100% accurate, you can 'open' a business as in the process of incorporating it, which you can do on any visa class or even a visa exempt. You cannot work in that business in any way.
No (holding any visa 'should' be enough but that doesnt mean every airline has got the memo.. I have had to have airline check in staff consult managers even with a non imm one time.
And of course immigration officers have full discretion, if they feel they dont want to let you in, they can often find a reason.