This doesn't surprise me, almost no municipality in the US will recycle number 5 plastics. Why Starbucks says they're "widely recyclable" is a mystery but it certainly seems an effort at deceptive greenwashing.
Starbucks HQ city Seattle, WA accepts all plastic numbers in the curbside bin.
Starbucks says it because a retailer- and packaging-industry-backed organization says it: https://greenblue.org/2024/01/04/the-how2recycle-guide-to-re...
There is no actual oversight from the FTC or related organization for recyclability product labels.