Some of his convincing (to me) points: FCA says "change the oil every 230 hours for severe usage". That would be every 2 weeks in a cop car that sees 24 hour usage. That's not happening to many cop cars, and dirty oil kills the needle bearings in the lifters. If you change the oil regularly, you should be fine.
Second one, if there was truly a flaw in the design (lifters not getting oiled), every hemi would die right away. FCA sells close to a million hemis a year, if it was a truly flaw, the issue would be huge and everybody would be having the problem, we'd have tons of reports all over place just due to sheer numbers. Instead it's a few people posting on a few forums (not counting the cop car/extensive idling issue where oil probably isn't getting changed enough).
I changed oil regularly, never idled for long, but still had the lifter problem at around 100,000 miles. For me, extended warranty took care of it, but would have been about $5,000 otherwise. I still bought a 5th gen, but will always get the extended warranty to cover me if the sh%t hits the fan. I consider that the price of owning a Ram. This has paid off for me so far.
I do disagree that the problem is not widespread though. In the grand scheme of automotive things, 5% is a huge failure rate, especially one of this magnitude. It isn't for nothing that the lifters are on permanent back order.
Having said all of that, we happily still drive the truck with the fixed engine, it's at around 178,000 miles now and running strong (knock on wood). We've owned two more hemi's, one with and one without MDS, and they were flawless well past 100,000 miles. I personally believe there isn't really anything we as owners can do to improve the odds.