This comment seems to be a hypercorrection, where someone attempts to demonstrate superior linguistic knowledge by correcting something that isn't actually wrong in the first place. You've likely heard somewhere before, almost certainly on HackerNews in fact, "lede" is proper and "lead" is not but don't really have a genuine understanding of it and are just repeating what you've heard before.
In actuality both "lede" and "lead" are correct. "Lede" is mostly an American and recent respelling of the word "lead" and "lead" still remains the predominantly used term (while "lede" is predominantly an American journalistic spelling).
The expression comes from journalism, hence why lede is preferred. It's something one should not do when writing an article - bury the most important point in the middle of the text.
I heard they used lede to distinguish from (hot) lead. But since linotype has been dead for 50 years this is probably moot now.
