How “deadly” are the adventures in Tales from the Yawning Portal?

I’m looking for what to run for my next D&D campaign. The promotional material for Tales from the Yawning Portal says this:

Within this tome are seven of the deadliest dungeons from the history of Dungeons & Dragons[…] Enjoy, and remember to keep a few spare character sheets handy.

Is this representative of the contents, or just melodramatic advertising? Obviously, Tomb of Horrors is written as a PC-killer, but what about the rest? How does the difficulty (as measured by “odds of most/all PCs getting out alive”) of the book overall compare to other published 5e adventures?

Reminder: per “Good Subjective, Bad Subjective”, to answer this question, one would either need direct experience playing several adventures from TftYP as well as other published adventures, or pretty solid expert analysis of the dangers in TftYP in terms of DC, CR, etc.