Google’s Gary Illyes confirmed on Twitter that Google doesn’t have a ranking signal that looks to see if a site has a trust seal on it and then gives the site a ranking benefit for having one.
— Barry Schwartz (@rustybrick) July 18, 2017
I can confirm your doubt
— Gary “é¯¨ç” Illyes (@methode) July 18, 2017
Those are the tweets so you can see them in context.
So don’t let people sell you trust seals to improve your SEO. It may improve your conversion rates and user’s perceived feeling of online safety but for SEO, no, it does not help.
Forum discussion at Twitter.