I think the RTV is unnecessary. It'll be a real mess next time. I replaced my t-stat 100K miles ago and no leaks yet.
Jabela's bleeding procedure is more complicated than needed. With fan on low and heat full hot, simply pour the coolant in very *slowly* until it comes out the bleeder screw. That should be all except for maybe a top-off after your next drive that fully warms it up.
2003 E39 M5 Lemans Blue: Truly an amazing car
1999 E46 328i Bone stock 5-speed: Beater and Track Car
247K and still running strong