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4 months agoNot correct; 10th edition core rules came out last summer, but the custodes codex this comes from was officially released on the 20th April 2024, it literally all happened just a few days ago. (Regarding the date discrepancy, people had preview copies before the official release)
Not quite correct, there were female models in power armour released with “rogue trader”, but very little lore and nothing specifically referenced female space marines. When they began actually writing 40K and 40K lore then they introduced the concept of the geneseed and it only working on males and they also introduced the sisters of battle who are indeed females in power armour but are not considered to be “female space marines” as such. None of it was actually retconned, it just wasn’t explicit in “rogue trader” and later became so when the first actual 40K edition was released.