Check what the word flimsy means. It does not mean skinny.

Once you do that, you will see that this is total garbage, because the flimsiness of a door has nothing to do with the process going on inside a building. I have been to plenty of factories with "flimsy doors." Ones with glass panes too. It is totally stupid to argue this.

Even if it were true to a degree, no small detail like that can bring the entire mountain of evidence crashing down.

What we are talking about is the application of industrial efficiency to mass murder.