The process in the article is effectively sintering. If [1] is any indication, you can get to within an order of magnitude of strength of cast/forged parts, if sintering variables are controlled for properly. Which may not be the case for a diyer, metallurgy is a complex art.
Yeah and I also worry about shrinkage - they're saying ~15%, which would be a massive issue with some profiles. I don't see how a lot of parts would work very well without distortion.
1.https://physics.stackexchange.com/questions/14635/what-will-...