Demo first, always. Ryan won't rate a slot he hasn't played, so the process starts on free credits with no sign-up and no money down. He runs several sessions, logs the mechanics spin by spin, and tracks the things a spec sheet won't tell you: how the Layers strip back, how often dynamite lands, and how long the game makes you wait between features.
Then he cross-checks. The demo read gets held up against Hacksaw's published numbers, which for Le Digger are a 96.26% default RTP, a 36.40% hit frequency, and a 15,000x ceiling. Where the studio hasn't published a figure, he says so plainly rather than filling the gap with a guess.