No shade, rastas got their heart in the right place but saying Selassie was a 'black African king' is like saying Abdel Nasser was a 'black African leader'. They may be African but they aint black 'sub-saharan emerging from the Congo rainforest' African, theres levels to this shyt. Jesus wasnt black, he was middle eastern, 'black Africans' were not about that monotheism, they were/are all about ancestral worship, which Jesus never advocated, he barely respected his father, which is most unAfrican.
Ethiopia is a multi-cultural nation, it doesnt only comprise of those semitic Somali looking folk you generally associate with them. Those naked Africans with big ol plates in their mouths are also Ethiopians and they were oppressed by the monarchy.
Rastas being a pro-black movement is cool, but deifying a semitic monarchy that was more christian-centric than the damn romans is kinda out there. Its not like the movement wasnt founded by Garvey a 'black' African.
Bowing to royalties is simply custom, they were also bowing to the Nabongo's and Kabaka's, who were essentially village chiefs/war lords, it didnt mean much in the grand scheme of things, ask Nyerere, Kaunda, Kenyatta, Nkurumah and uncle Bob.