I haven't heard any testimony that the toxicologist had been given the police report on what Murray stated, at the time he did the analysis. So no, he didn't know.
Haven't seen ANY current medical records entered into evidence, or notebooks collected at the scene, or anything like that. It's critical to note times/amounts of medication given, but Murray didn't seem to know that. He went so far as to say "at the hospital he wasn't wearing a watch, and had no concept of time!" But yet timing and amounts of medication are crucial for safety. At the very least, he should have recorded amounts and times, when medications were given. That he apparently did NOT do that is yet another sign of gross-negligence.
Regarding whether or not Michael self-medicated with benzos? Regardless of tox report, ADDITIONALLY, the location of bottle with benzos was in the bathroom, not on the night-stand. Michael would have had a push an I.V. pole in there (and there was that condom catheter, too) to take the pills. PLUS, none of Michael's fingerprints were found on bottles of medications. Murray's fingerprint WAS found on a bottle of propofol. Pretty tricky, for Michael to open a pill bottle but leave NO fingerprints? Nope. He didn't self-medicate.