No argument regarding how wise it is to do it. Everyone's agreed there potential risks of a violation. That's absolutely not the same thing as saying that it's not possible to do it.
Did he elude to why he held the incorrect view from the outset? Misread the regs? Didn't read the reg? Read them correctly then forgot them over time? Blended a few regs together, maybe? I'm going with that last one per an earlier post.
Not trying to beat a dead horse, just wondering how someone with that much flight time and serving as a DPE role would have the wrong interpretation of something so fundamental. Am glad to hear he came around, though.
During the discussion we had on the phone it became the whole acting/logging and under what rules (mis)interpretation. There was also some reading into a publication (not a regulation) that was seemingly ambiguous, along with a FSDO statement that was seen at some point.
We went over 61.51 and the erroneous jump that was made was to that to log PIC was you have to follow all regulations you are flying under. And the interpretation that since flying under IFR you must also be able to act as pic to log it.
The discussion (from memory and paraphrased/summarized) went more or less like this:
Each line of dialogue contained much more than
Me: You had a podcast that said blah blah blah
Him: Yes, and I was saying I am taking a VERY conservative stance on how to do things.
Me: OK, so the scenario is I am not-current, (in the 6-12 months since last 6 approaches) you aren't a DPE or CFII, we go fly in actual, no hood, you never touch the controls, and we file with you as PIC, but I make all the airplane noises.
Him: You can log the approaches, log it as total time, log it as instrument time, basically everything except PIC. The acting PIC can't log anything except PIC time.
Me: 61.51 says.
Him: You both can't log PIC time because it's not a 2 pilot and no one is safety pilot.
Me: Agreed, but both aren't trying to log it.
(several tangents and other examples, endorsements, expired medicals, out of night currency, rated vs endorsed, etc...)
Him: You can't operate under IFR if you aren't current, you need to be acting PIC for that under 91.167 in order to log it
So this is where the misinterpretation happened because the two got glommed together along with whatever some FSDO said somewhere
Me: Yes, but acting isn't logging.
Him: The responsibility falls on someone for the flight and it can't be you, you can't have a flight without a PIC
Me: Agreed, but we are only talking about the logging portion, not responsibility of flight, etc...
We both pulled up 61.51(e)(1) and we both agreed there are only 4 provisions (i, ii, iii, iv) to log PIC time and that ii, iii, and iv don't apply
I then said forget the whole acting thing and we will only read 61.51 because this is the only thing that matters for logging. He agreed to the premise and once we severed 91.167 from 61.51 he was like yep, you're right. I also pointed out there is no provision to log it just sitting there as acting PIC, you have to do something in order to log it. He then agreed on both parts.
The we talked about a bunch of other stuff and other weird loopholes, how basic med was a complete disaster when it came to SIC/safety pilot, how people misinterpret instrument currency and regaining it.
Basically wrapped up with yes, it's legal, probably not common, most likely not safe, and to be extra conservative just go with a CFII.