@Dan O
Police Regulations , TM30 in the case where a foreigner returns to the same address were published in the Royal Gazette in June 2020, effective 30 June 2020
Summary here -
http://www.ratchakitcha.soc.go.th/DATA/PDF/2563/E/141/T_0001.PDF
What this means is that having once filed a TM30, if the foreigner temporarily stays elsewhere, but returns to his registered place of residence within the validity of his current permission of stay, or a valid multiple entry visa or a re entry permit and returns to his already registered place of permanent residence, then there is no requirement to file a further TM30.
See attached files
This is published in the Respected Royal Gazette of Thailand, no Immigration office in the country is above the Royal Gazette.
Peace.
TM30 reporting regulation (Eng).pdf
TM30- 2020 regulation-Thai.PDF