Searching doesn't find the titles, but Guide shows them!
https://www.hbo.com/schedule-search-results?productIds=617074 has multiple dates and times for Truth About Killer Robots on HBO.
Thurs., 29 = LEGO Jurassic World: Secret Exhibit on NBC (https://www.nbc.com/lego-jurassic-world-the-secret-exhibit)
Searching on DCX3510M DVR's Navigator doesn't get any hits. However, I can find them in Guide if manually go through it. Is anyone else having this problem too or just me?