Starlink satellites aren’t large enough to survive the heat of reentry. A more likely concern is the various materials vaporizing and dispersing into the atmosphere, as was mentioned in the article.

That being said, calling them “heavy metals” like the interviewee did is rather dubious. We’re not talking about lead, as what most readers imagine when they hear that term. It’s mainly aluminum and copper. The person interviewed is picking their words to overexaggerate their claims