How do I get Strauss to open up about the gargoyle?

Solution 1:

According to the VTMB Wikia, you need a certain amount of persuasion to get this option if you are not a Tremere.

I haven’t verified this myself, but given that such dialogues show in blue when available, it is easy to obtain this information. Also, if you have sufficient free points available, you can test this yourself by boosting your charisma or scholarship.