This is NOT trolling.
TiVo largely invented this whole category, with a fantastic product, and was screwed over by a bunch of companies that developed competing technologies and used their market share and tying to basically "kill off" TiVo.
I know plenty of people my parents age that go into Cox cable and ask for a "Tivo" and come out with a Cox-branded DVR and don't know the difference. And TiVo has to try and subsist on $9.95/month for a product that was category creating, while the subscribers get something that is a crappy copy but included with the service provider. TiVo owns patents on much of the technlogy, and the companies should LICENSE it. They chose not to.
So no, this isn't a patent troll. There are exactly 2 criteria for being a patent troll:
1) Have few if any real products based on what you have patents on (OR, just buy other peoples' patents)
2) Sue in Eastern Texas
If both of these are met, THEN it's definitely a patent troll. Does TiVo met either of these?