Sounds like he most definitely saved their lives. Even without that witness testimony, just the parameters they were in, especially on an old ass soviet seat that didn’t have a great track record to begin with…….hell, 300 ish AGL (while also descending at several hundred ft/min I’d assume), you dont have many more seconds even in a modern western MB seat. Especially if you pile on the AoA and start rolling over (though it sounds like the PIC did a decent job of not really doing that at least). It is interestingly apparent in the report that they probably aren’t friends anymore and aren’t going to the others bday party now