Dis reference on Lazarus Labs terminal

[idbeholdME]

Not sure if someone posted it here before, but today when playing through the campaign once more, I noticed this text on a terminal in Lazarus Labs. Seems like a direct reference to the Dis level from the original Doom. Definitely not a typo I think.

Here's a pic:
https://postimg.org/image/s3vtyf8fn/

[Tetzlaff]

Do not stand below lid during discharge?

[MFG38]

Tetzlaff said:

Do not stand below lid during discharge?

I mean it makes sense.