Spanglish is the world’s fastest growing linguistic hybrid

Honestly the piece reads like some ethnoculturologist is trying to reinvent linguistics concepts that have been common knowledge in that field for decades.

That's common in people who are fluent in two or more languages, even when they don't speak some sort of creole. My mother and I speak English and Russian, and will frequently swap out words mid-sentence, or do the other thing the article mentions as an example, starting in one language, and finishing in another. She and her Russian&English speaking friends do the same.

But we're not speaking Rusglish, or Engrussian, or whatever. It's just a common facet of being multi-lingual.

Spanglish has been around for a long time, so while it may have the most number of potential speakers at almost half a billion Hispanophones, there are about a quarter billion Hindi speakers, and even more than that when you include the variants and offshoots of it which are linguistically compatible which have English hybrids. As more people are exposed to English media in countries that speak those languages I can see it being a "faster growing linguistic hybrid". Places that already have a lot of exposure to English media would already likely have English language hybrids.