I can see that the Philips HearSuite programming software does include tinnitus support. But whether Costco suppresses this feature like they did with the KSxx rebrand of the Phonak aids or not, I don’t know.
Maybe the question is not whether the different brands’ aids have tinnitus support in the Costco version or not, but the question is whether Costco’s policy does not allow their dispensers to enable this feature for their customers because they don’t want to expend the extra time and effort to support this, since their $1499 price includes the service and is not a la carte.