No, they patented a plastic shell containing buttons which charge capacitive screens but do not rely on transference. In other words, they can be used with gloves or anything else that inhibits capacitive touch.
They cited about a zillion other patents for what you described: plastic cases with capacitive buttons (physical keyboard attachments, etc.).
This is a perfectly acceptable usage of the patent system.
Incidentally, this company tries to cite their own patent:
PlayCase – U.S. Provisional Patent Application No. 63/668,169 (filed on July 6, 2024)
But a provisional patent is not a patent. Depending on its claims and citations, it’ll be interesting to see whether or not it’s granted by the USPTO, but my money is on no.
They also use unlicensed trademarked images on their webpage.