No. But if the reinforcements they fetch from the next room will result in a TPK due to the way the module has been designed, then fetching reinforcements is not really a viable option for a DM that isn't primarily interested in killing the PCs.
Which is not to say that PCs should never face overwhelming forces from which they will need to flee. But it is to say that this kind of "balance on the razor's edge" encounter design is inherently fragile. The reinforcement thing is just a specific example of how ridiculously fragile My Precious Encounter design is; and the way in which that fragility encourages (and, in some cases, enforces) a blandness in adventure design (as all encounters present the exact same level of threat).
There are going to be locations where there will be a near exact level of threat in any game. There will also be occasions where, as you have listed, the party must run. While some like the valiant chewing-bubblegum taking-names style of crushing the offense, I and my players and the DMs I play with for my own amusement would rather have "Ideas of self-preservation" in their living, non-enthralled players. This is why we have Listen, Spot, Search, and all other senses-based interpretations of the game. Heck, there should be places where the party gets slammed just because that group of baddies in Room X hears, smells, feels, or sees something amiss.
But never tastes. I discourage licking of the walls in my monsters.
Well, I said the exact opposite of that. Not much point in continuing a conversation with someone who's professed an inability to comprehend the basic meaning of what I'm writing.
Please don't resort to an ad hominen on this. Perhaps they needed clarification, which they have now received, and may respond to that now.
Okay, now that sort of railroading is a perfect example of My Precious Encounter design: "You've ruined the encounter I planned?! FINE! THEN I WILL ADD MORE MONSTERS TO FIX IT!"
Or it could be "I completely botched that run here, and have made for an extremely blase game there... Let us actually put a bit of a challenge here for the group. I'd rather play and not be bored because the DM missed a step when writing and has now caused the climax to fall flat.
Your points are definitely valid, but let us be honest... You are advocating a play style of one sort while others are going another route. This is mostly just a philosophical showdown.