24601---You ask: "Is their recommendation of "third-party" solutions a vote of no-confidence in Infineon's software ?"
It is ABSOLUTELY a vote of no-confidence(Infinion) "for some models". HP specifically states that on some HP models third party the software "MUST be purchased separately". Therefore the logical question becomes: Which models did HP give Infinion a vote of no confidence?
"Platforms containing a TPM require both a TCG Software Stack (TSS) and embedded security software. All models provide the TSS; embedded security software must be purchased separately for some models. For those models, an NTRU TSS is provided to support customer third-party purchase of embedded security software. We recommend third-party solutions such as Wave Embassy Trust Suite."