Operations engineers are engineers, just as much as other engineers. But when you’re discussing the subgroup (opseng) in specific and whether it’s a member of the overall group (engineers), it’s logical and appropriate in conversational English to refer to the subgroup by specific label, as the comment you’re replying to does.

Women can be sexed at birth as female, male, intersex, neither; women can have genes for XX, XY, XXY, etc; women can have zero or more genitalia; women can have masculine, feminine, androgynous, mixed facial bone structures.

Each of these is a valid subgroup of women which can, if necessary, be described as a subgroup. Normally, just “women” should suffice, but the app linked by this post actively excludes at least one of those subgroups from the label “women”. So it becomes necessary to discuss those subgroups by name, such as “trans women” and “black women”, in order for discourse to occur.