Do you think hearing how Trump is mysteriously (I say this cause, you know how he is) is poling well among Latinos and African Americans (maybe Asians too), that does this worry you about Biden's chances?
If you think this is some weird notion, may I remind you that what doomed Hillary Clinton in 2016 were her poor performances among Black and Brown voters compared to Obama in 08 & 12.
Remember when Hillary was consistently close to 50% and leading in a ton of swing states with low undecideds? Oh wait, she wasn't, because 2016 and 2020 are two completely different election dynamics.
Hispanic support for Dems is often under-polled, especially in the south and west. Similarly, Republican support among black voters is often over-estimated.
Politico and CNN (which the Atlantic cited) are not legitimate sources. They are political tabloids seeking to create a narrative because they want ratings and money.