At least four members of the Squad have expressed support for Biden since the first presidential debate. Two have enthusiastically backed him, including Reps. Alexandria Ocasio-Cortez, D-N.Y., and Ilhan Omar, D-Minn.
Bit of an exaggeration to call "Biden is running in the race so I support him." an enthusiastic endorsement. Talib has very good reasons to not be endorsing Biden, she'd be throwing away her own credibility with her constituency if she was backing him.
I think the authors of this article are kind of desperate to manufacture division on the left and isolate members, all the members of the Squad are making their calculations based on what's most effective from their vantage, I don't think that really indicates some kind of strife.