As a software engineer whose original line of work was continental European philosophy, its striking to read things like this because it shows how little we've progressed in philosophical thinking since Immanuel Kant's Critique of Pure Reason. The radical idea in Kant is that subjective experience has an objective structure: that means we can grant the validity of scientific observation, the key insight being that what you feel and see empirically (what gets called qualia), doesn't exhaust the definition of subjective experience, but is derivative of its essential structure. Once you make these distinctions, talking about why scientific observation is valid is easy.

The fault is that this doesn't completely eliminate a certain nuanced form of solipsism, and this is where Hegel comes in, but does make strong guarantees that gravity won't stop working the same way tomorrow.