No. STB, Tourism Australia, Tourism Malaysia (MOTAC's tourism promotion arm), Destination Canada, and the US Travel Association are destination marketing organisations (DMOs). They co-fund destination campaigns, publish voluntary guidance for partners, and measure visitor-economy outcomes. They do not approve or reject a hotel, airline, or insurer ad.
The regulators of advertising claims are different bodies: MAS, CCCS, CAAS, PDPC in Singapore; Bank Negara, MCMC in Malaysia; ASIC, ACCC, OAIC in Australia; US DOT, FTC, state Departments of Insurance in the United States; Competition Bureau, OPC, provincial insurance regulators in Canada. A page that conflates a DMO with a regulator loses credibility with anyone who has run a regulated campaign.
Where the DMOs do matter for paid media: co-op funding gates, brand-Singapore or Signature Experience campaign certification, and visitor-economy data feeds used for targeting. Treat them as data-source partners and campaign coordination peers, not rulemakers.