Hi Graham, where does that translation come from? And do you know anything about the original Japanese text, such as, what name might have been used that was translated as Avalokiteshvara? Thanks!
O'Sensei often referred to the kamae of love. Thus I assume that a Buddha of compassion could also be used.
Anyway, in answer to your question on original Japanese text, no I don't have that academic knowledge. I can refer you to source though and you can if you want to get in touch with him and he will answer your queries no doubt. He actually trained with O'Sensei.
I'll send you the link in a private message.