RNA rich in adenine is not specific to retroviruses. Any RNA can be reverse transcribed into DNA and reverse transcription is not specific to retroviruses.

There is no data in the Montagnier experiments to exclude the RNA being cellular.

As far as the sequences are concerned, the HIV genome is reported to have immense variations, while for all other RNA viruses, the variation is about 1%.

According to Peter Duesberg...

"There is a range, in which you can mutate around without too much penalty, but as soon as you exceed it you are gone, and you are not HIV any longer, or a human any longer... then you are either dead or you are a monkey, or what have you."

By comparison, two RNA containing viruses (polio and influenza, the latter after 27 years of dormancy,) vary by less than 1% as do RNA molecules self-assembled in test tubes denied the organising propinquity of living cells.