App description says "Uses and needs external Irdroid module" and indicates it's a port of LIRC.
IR ports and their drivers are relatively simple, compared to audio, graphics, FM, etc.
So I'll bet that somebody will find/build an HTC One AOSP IR solution in the next 3-6 months. I've briefly considered it myself, but there are enough apps out there already IMO for when drivers become available.
BTW, I got the app link from this good thread about things missing from the coming Nexus Experience version: http://www.androidpolice.com/2013/05...-audio-switch/
My impression right now is that HTC One sales are doing better than many of us expected. The Nexus Experience thing has convinced me that I'll be getting one soon. And Samsung GS4 sales seem lower than expected. I think HTC One is "stealing" some GS4 sales.
My point is that I think HTC One XDA/custom ROM and apps development will do well, and solutions for IR and some other Sense related features will be found.