In all my years of gaming I've never understood boasting about being a "killer DM."
It's extraordinarily easy to kill PCs or to take their stuff, make them depowered etc. As the saying goes the DM has infinite dragons.
Anyone who thinks that's, in any way, the mark of a good DM, is not someone I want to be playing with.
Back around '81-'83 there was a group of 10-20 folks once a week playing in a game that a local comic/record/book/game store owner in Rockford IL ran. They ranged from maybe 7th grade to mid-40s and some had probably played with Gygax before the rules were published, and the players used whichever of 1e, B/X, or OD&D they had (I'm not sure which version the DM used).
About 1/3rd of the party died every night, and it was a feat to make it to 2nd level. My elvish cleric was one level below retirement in the boss battle after a probably year long dungeon crawl. The vampire touch (iirc) brought me down in level, and then (after I had to go home so my parents didn't metaphorically kill me) the friend I had playing my character reported the lich teleported behind the back row of the party and let off a 20-die lightning bolt.
The DM didn't try to kill us, she played the things the way they were written up and we all had a blast. And none of us spent a lot of time making up our characters, even though we tried to throw in some flashes of color. (Iirc, my 300 lb. cleric brought chickens with in the dungeon and always scouted out restaurants when in town. He made it a couple of levels, but then I [and he] learned what the Necronomicon was and that you shouldn't read it, or there's a chance Cthulhu decides to pay attention to you and you need a new character).
I think the important thing is that we all knew what we were getting into (or at least knew if we talked to anyone else before joining, and certainly by the end of the first session) and that she didn't play favorites. And I can't think of anyone who played back then wouldn't love for Bev Mason to be back at Toad Hall running games so that we could do that again.
Even if it was totally unlike our own games that we ran for each other where the characters seemed to last a lot longer, we shared GMing, and we would have been crushed after a while to have them die. And even if it is totally unlike any of the games we've played since or run ourselves.
On the other hand, some of the killer DM descriptions on the last few pages sound like no fun at all.