This article is almost two months old. If I'm not mistaken, these researchers were actually the first to test and find S-CoV-2 in wastewater. Their data was shared unpublished, in the name of haste. This led to a prompt parallel study by Lodder & Husman, who hit publication within days of the study named in the parent article.

These are the folks who set off the whole 'testing wastewater for covid' thing. They're not falsely claiming to be first on the scene. You're being misled by the context, because someone posted an old article.