Given Reddit's fall, what's an alternative to /r/BodyWeightFitness and its Recommended Routine? What bodyweight routine is scientifically valid, updated when needed, and aimed at strength?

This will not directly answer your question but while perusing at work I came across darebee.com , which is a fitness website run like Wikipedia. There are no ads whatsoever. There's a video library showing how to do tons of exercises. Workout programs can be filtered based on your equipment availability and ability level, and everything is available in a PDF download absolutely free.

Really cool site, give it a look.