Perhaps your friend has already been informed or even interested about Bitcoin and crypto. The greeting is basically promoting Bitcoin and crypto.
its not promoting if his friend already know that op is into bitcoin long time ago but i guess it some kind of a bragging that his friend is now into bitcoin . it can be a form of promotion too if he send the same message on more than 5 person and those person are not yet involved into the crypto verse .
He has forwarded the message even without knowing the true meaning, and the message is True.
why not ? the message can be easily understand if we search its meaning on google and who knows what if your friend is now into bitcoin now ? and you arent aware with that because you dont see him or talk to him oftenly .