Unless there are disclaimers, postings on a company website are company approved. Writeups on MLS.com may intend to be “independent” but by the very nature of being linked by the “news” button on their front splash page, it absolutely give credence that the league is issuing the postings.... or in other words, a PR Dept (perhaps staffed by freelancers)MLSsoccer.com operates mostly as an independent news site, which is good. They post rumors, negative news stories and critical pieces on players and coaches. They also offer editorial commentary. It's a pretty good news/opiniom/rumor site on it's own outside of official news
They could just wait for the clubs to officially announce player/coaching moves and stay silent until then, or they can publish credible rumors as they come up, often days or weeks before it's official..
The website is not a PR dept.