OK, gotta mention, the ????????????????????????? eeeeeeeeeeeeeeeeeeeee stuff is obnoxious and is not helping you one bit.
ANYTHING which pulls the playback pin low causes playback. An 8051 can do that. So can a button, which is what it was designed to do. But aside from that, there's no control. It can't stop at what should be the end of one message and later jump to the beginning of another message. It doesn't know when the recording is done. There's no capacity to interface in a useful, functional way, with the 8051 or any other device. The designer made it for some single-purpose standalone product like a cheap voice-recording message reminder. It won't really do what you want.