Pretty sure the entire "argument" was just MM pointing out that your concept differs from what's assumed to be the canonical design of the Slig. He likely would have done the same regardless of the creature you drew if part of it's design was inaccurate according to what we currently know. Then, when you said you hadn't seen proof of any of the things he pointed out, he provided proof.
It's a form of critique. If you didn't intend to make it inaccurate to what's been established, then someone pointing out the inaccuracies might help you if you ever go to draw something similar in the future, avoiding the same mistakes. Or heck, someone pointing out that the original concept varies from what you had in mind, you might be able to blend them or use them to create something even more interesting or solid than what you initially thought of. If you're uninterested in critiques, just say so and most reasonable people will just be like "o ok" and move on.
The entire point of concept art is to establish what's being made. There will be older and rejected versions of each concept, like muds having nipples. A lot of the time when nipples are added to humanoid alien figures, it's purely to make the creature more relatable. Obviously it's much easier to relate to something that looks familiar than it is to relate with something so alien there's no resemblance to anything we've ever seen before. Obviously they decided nipples were not the way to go here.
Also nipples on something born from an egg could make biological sense. A belly button on the other hand..............
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