Is split attraction real?

I wanted to ask this amongst people who have sense (iykyk) but I've met a few people now in the LGB community who are against the topic of split attraction.

I could absolutely be missing out on a point of harm or redundancy, but I've been surprised by this as I accepted it as real. Just to make sure we're all on the same page, this is what I accepted as split attraction:

• Asexual aromantic = acearo
• Asexual homoromantic = lesbian
• Asexual biromantic = bi
• Asexual heteroromantic = straight
• Homosexual aromantic = lesbian
• Homosexual homoromantic = standard lesbian
• Homosexual biromantic = bi
• Homosexual heteroromantic = bi
• Bisexual aromantic = bi
• Bisexual homoromantic = bi
• Bisexual biromantic = standard bi
• Bisexual heteroromanric = bi
• Heterosexual aromantic = straight
• Heterosexual homoromantic = bi
• Heterosexual biromantic = bi
• Heterosexual heteroromantic = standard straight

Irl idk if homosexual heteroromantics and heterosexual homoromantics exist but overall they're both bi.

Is there a fatal flaw in this thinking or a reason to not accept it? Is it harmful to lesbians? Thank you