C4 transmission housing question

[jacrz]

I removed my oil pan in order to attempt to address a nasty oil leak by replacing the oil pan gasket and also the rear main seal. I noticed that the bottom of the transmission housing facing the oil pan is covered by this screwed-on plate that is clearly not attached in a way to prevent fluid flowing out. In the latter picture, I had removed the plate to clean it. Is this setup correct?

 

[Broncobowsher]

Yes. Gives access to torque convertor nuts, as seen in your picture.
Never designed to "seal", just keep big stuff out.