TDM.com.mo is the web presence of Macau's public broadcaster, Teledifusão de Macau. A media outlet with 25 years of archived history and a clean security record sounds reassuring, and the site does publish a privacy policy and legal disclosure. That's all good for a news organisation.
So why use caution? The biggest issue is a broken SSL certificate. Right now, the site won't load over a secure connection — any modern browser will show a warning. That's a problem for a broadcaster that wants to be trusted. On top of that, the site is built as a single-page app, so basic details like a phone number or social media links aren't visible without running JavaScript. For a news outlet, that lack of straightforward contact info is unusual.
If you're asking is tdm.com.mo a scam, probably not — the domain history and legal pages point to a real entity. But is it safe to use? Not until they fix the certificate. Until then, treat it as a site you can't fully access or verify. Look for alternative official channels if you need reliable information from Macau's broadcaster.