I think the news is a fake one or someone is trying to give a bad name to Karmapa. Karmapa has not said anything since the scandal broke out and CTA has not done anything to address the issue. It seems like people who are associated with CTA will have problems after problems and eventually, they will end up in a mess. No good news ever comes out from people associated with CTA.
Karmapa Ogyen Trinley is already not in good terms with the CTA a year ago and that is why he fled India to the western countries and refused to come back to India. He even took up a Dominican passport to escape the clutches of CTA.
I guess CTA has been mistreating him and controlling his movement too much which made him unhappy. Karmapa did said that he is unhappy with his current condition because he is unable to perform his duties as the Karmapa and he also did not get the education that he needed.
The sex scandal is most likely a fake one because until today, there is no more news about it. Only Taiwanese media reported this new, no other international media shared this news. What some people said make sense also. Karmapa was under the surveillance of CTA and Indian government 24/7, it will not be easy for him to have and maintain a relationship with several women.
I think it must be a set up by the CTA. They are angry with the Karmapa because he ran away and disobey them. Now the CTA does not have a successor to the Dalai Lama anymore, when the Dalai Lama passes away, they will be having problem. When people support the Tibetans, it is not because they support the CTA but because of the Dalai Lama.
All of us know the CTA always uses Buddhism and high lamas to get support especially financial support from their sponsor. They sell Dharma and Buddhist masters like they are a merchandise. Look at how the CTA and people around the Dalai Lama hooked him up with a sex cult leader? The Tibetan leadership only care for themselves, never for their people.