LPTV stations are exempt from many of the requirements that full power and Class A stations have to follow.
K03IM-D also limits their channels to 24 fps, something a major network affiliate wouldn't be able to do as their network feeds originate at 29.97/59.94.
Chipsets capable of decoding HEVC didn't become mainstream until late 2015, so TVs made prior to 2016 have no chance of supporting it with their built in tuner. Even after that date, standalone TVs still likely won't be able to support it unless their manufacturer coded the ATSC 1.0 tuner side of the TV to detect Stream type 0x24 as H265 and also accept AAC audio instead of AC-3.
It's the same thing with H264, which the Tablo has problems with as their developers hardcoded their player and transcoder to expect MPEG-2 video from ATSC 1.0 channels, even though H264 has been an optional part of the spec since 2008. (Because of that, the Tablo also has problems with stations that have audio only subchannels for radio simulcasts or reading services)
If you're using a "bring your own viewer" setup like a PC tuner or HDHomeRun you likely have no problem watching it as long as you have a GPU that came out after 2015/2016 or a powerful enough CPU that can software decode 4K HEVC, but you might have to use a different player like VLC or Kodi. You won't be able to use Windows Media Center, ATI/AMD's Multimedia Center or older versions of Hauppauge's WinTV software that ceased development long before the HEVC spec was finalized.
