I also agree that RAW, I'm not sure how Bonisagus and the founders made Hermetic magic, I'm not sure it's possible. You need to consider that at the very least:
(1) Higher than 10 virtue points for Bonisagus
(2) Custom Virtues to integrate magic better AND faster. Bonisagus worked with each other founder for not even a year on average. Insanity under RAW.
(3) Bonisagus would originally have had to make Hermetic Magic Theory. Under Hedge Rules this is quite hard, and I think he may have used Luck or a modified virtue for this.
(4) Consider that Bonisagus could be a total liar, and much of the history before the Order of Hermes is a lie and or, the history of the Order is a Lie.
(5) This leads to my view, that in fact, Bonisagus merely refined existing Mercurian Magical Theory, or stole it from the Egyptians or Greeks. In most of my recent sagas "Hermetic" Magic is something that was once wide spread in various proto forms all across the Roman Empire and the Middle East. The knowledge was destroyed in the Roman-Persian wars, and as the Western Empire collapsed much was lost.