According to the source, Spencer eradicated all of Patrick's memories with a drug and gave him a blank canvas, then filled it up with "memories" of being in the hospital all his life. And that's supposedly why he falls so madly in love wiith Marty - a vestige of his old character is still in tact.
Why would he torture the Buchanans, you ask, Shelly? As if anything else we're looking at makes any sense?
Anyway, it's just a rumour getting bandied around.