It's a reveal that's not making any sense.
1.Stef only got the visions when her grandma got cancer
2.Kimberly got ressurected in 2003, she would be in her early forties when FD6 happens,
3.Death usually kills the remaining survivors after a few months or a year (he's been doing in other survivors during those)
4. Iris and JB never tried to do Kimberly's method while there was still time.
I know for the plot to happen people need to be stupid and ignorant but to make Tony Todd's character have the solution to escape death's list but never reveal it after FD2 smells like a retcon.
Bludworth says that its "risky" but both him and Iris were on death's list already, if it went wrong, at least they went out on their own terms. This is an obvious retcon done to give him and Tony Todd a send off and Im able to let it fly on that alone.
FD6 falls into familiar narrative traps of the series. Like them heading to Iris's cabin, thinking that will be safe somehow. Which is insane because her cabin and its surroundings were a deathtrap. Its like they saw that scene with Alex hiding at that cabin in FD1 and thought that setup would have been perfect if he never left it (which the scene itself shows that it wasnt, he barely avoided getting tetanus). The only example of "hiding" from Death that worked was what Clear was doing in FD2 with the padded room.
And Bludworth mentioning Kimberly does make one wonder why she hasnt wrote a book or made videos talking about her experiences. Sure, they would probably be taken as deranged ramblings of a woman with survivor's guilt but surely she would know that there was a chance someone else might have that premonition and thus informing them of the "revive" rule would be the game changer.
The issue is overly analizing this series, especially after 2 where the series might as well have become an anthology with ocassional references to previous entries. Its just not something the writers thought about it (if anything, FD3 barely kept itself from revealing Kim and Burke died off screen, showing the revive rule was bogus).
Some speculate that Kim being mentioned could leave the door open for her to appear in another sequel, possibly to replace the Bludworth role (as lets face it, she and Burke are the only ones left with some level of understanding of Death's inner workings).
If there ever be another sequel and given how Bloodlines made bank, there likely will, I'd prefer if we had a ship disaster and have the main character be related to or be a conspiracy theory type that tied the events of the deaths from the previous entries (which obviously sounds insane to anyone else...I mean, even then, it is recognized that the sheer idea that death is an actual existing force and that it seems to take sick pleasure killing anyone that doesnt die when it feels like is a rather extremely existentual scary one so no would want it to be true).
It would help have someone that is informed from the very start, almost like a stand in for veteran fans that watched since the beginning, and may actually have a chance to best death with this "self awareness".