@Ne**
There is no reference to an exemption in the Royal Gazette posting for the DTV. The only reference is to the Immigration Act BE 2522, there is no reference to the Labour Protection Act or the Foreigners Working Decree.
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Indeed, Section 7 says "Aliens and their legal spouses who have been granted a special tourist visa (Destination Thailand Visa: DTV) and wish to work in the Kingdom, upon receiving permission to stay in the Kingdom, must apply and change the visa type to a temporary resident for work first, and then apply for a work permit in accordance with the law on the management of alien employment." (Google Translate)
So this is EXPLICITLY saying that what people are going to be doing on the DTV is not "work in the Kingdom", and that if they actually want to do this they have to change visa to one allowing work and also get a work permit.
I understand you can read the labour laws and come to the conclusion that it covers remote work because it doesn't explicitly say it doesn't. Every indication though is the Thai government does not interpret it that way as they DIDN'T see the need for an exemption.
Unless there's an exemption somewhere else that I'm missing, but my reading of the DTV it seems pretty clear they are saying remote work is NOT "work in the Kingdom" covered by those laws.