Lenovo produce extensive manuals for every Thinkpad, and they're designed to be fully field-serviceable, since that's what they're selling with their on-site warranties. The laptops aren't optimized for it the way they were in IBM days, but it can be done.
Same procedure as Gen 2 by the looks of it (pg 108), not sure how it has a 9 for an iFixit score, unless you discount replacing the panel itself, or consider replacing panels adhered with adhesive tape as an easy repair. I personally do not. Having replaced many cell phone digitizers and screens in my day, I see it as messy and prone to error. Maybe the score is relative?
