That sounds less like we were given a false image of the occurrences of the original five-year voyage of the Enterprise and more Kirk being guilt-wracked over the loss of crewmembers under his command, blaming himself for their loss because he wasn't fast enough, or he wasn't strong enough.Gene Roddenberry himself called TOS an inaccurate representation of the five-year mission in his TMP novelization. It opens the door to question if anything we've seen in Trek is what "really" happened, or some skewed after-the-point interpretation.
Here's the relevant section of the TMP novel:
Unfortunately, Starfleet's enthusiasm affected even those who chronicled our adventures, and we were painted somewhat larger than life, especially myself.
Eventually, I found that I had been fictionalized into some sort of "modern Ulysses" and it has been painful to see my command decisions of those years so widely applauded, whereas the plain facts are that ninety-four of our crew met violent deaths during those years - and many of them would still be alive if I had acted either more quickly or more wisely. Nor have I been as foolishly courageous as depicted. I have never happily invited injury; I have disliked in the extreme every duty circumstance which has required me to risk my life. But there appears to be something in the nature of depicters of popular events which leads them into the habit of exaggeration. As a result, I have become determined that if I ever again found myself involved in an affair attracting public attention, I would insist that some way be found to tell the story more accurately.
(P. 7-8)
Then there's Voyager, which implies that up until "Latent Image" we'd been seeing the Doctor's censored, Ensign Jetal-free version of the show.
It's fascinating to wonder what we might be missing...
I agree- while I think the meta-statement on the show does shine through pretty clearly, I also see nothing in that excerpt that the Kirk from the show would not himself say, even if the events depicted in TOS were to be shown 'literally'.
It's funny how we want our televised drama to be a literal depiction of events when we are so good at 'filling in the blanks' in our literature, stage shows, music, computer games- virtually every other media has a sort of 'don't interpret this literally!' hole in it that our imaginations fill, and you'd think as Trekkies we'd be so good at circling that square, because TOS is so much like a stage play, you have to sort of mentally blank out the creakier aspects of the show, yet we still want that show from the 60s to mesh into the more recent shows from the 90s, rather than fill in the blanks ourselves. It's interesting, and I think the 'propaganda' thought-experiment is a clever way of interpreting those gaps.