I like Flightradar, and use it at least daily. But I would never draw conclusions, it's indeed a hobby site, best endeavours and all that, and draws on third party information and an awful lot of guesswork. There is no point in relying on it for timings (or even aircraft actually) - and quite pointless really when BA's own FlightStatus is sufficiently accurate that BA's own crews use it to know what's going on. HAL's website also gives accurate information. Other websites? YMMV.

Anyway today's PDX is still on time, estimated runway take off time of 15:56 with a pushback estimated time of 15:30, so on time. They have just opened the gate at B38 so I would be heading there now if you are on today's service.

14:58 hrs edit: they have just started boarding assistance passengers so you really do want to get to the gate now.