Everytime you have to act on the tube (as in this case moving fro a cab to an another) it must be discharged
Well, I'm an electronics engineer, and I disagree. Moving a COMPLETE monitor is _not_ the same as acting on the tube.
Also, the high voltages are nasty, but not killers. Yes it's high voltage, but there's no real power behind it. It's not like a hi-voltage power line that is hanging in the air to power cities with electricity.
Yes, it's a nasty bite (and yes, I've experienced it one time). My uncle has had several of them and he's still alive and well (he has been repairing TV's for 30 years).
I don't care what people write, there are millions of lies written all over the internet, I care about what people write he KNOW their stuff, not just "howling with the wolves".
The second link you mention even says it in the first line:
Before you go diving in and start pulling out Anode plugs,See, and that's not what you do when you simply move a complete monitor over.
But yes, if you are going to separate the tube from the chassis, or even plan on only touching the anode cup, YES a discharge _must_ be done.
That second link is the perfect way to do it. I've seen suggestions to use an uninsulated screwdriver and some wire etc. and I feel that that is even MORE dangerous than not discharging at all, because it's very easy to accidentally touch the metal part of the uninsulated screwdriver. That's why I say don't do it if need _really_ necessary.
I have a unit that's a HV probe and meter in one unit that I use for measuring the HV and discharging it. Without any exception all the tubes I discharged had no charge anymore when I did the discharging, but I STILL do it EVERY-TIME to be 100% sure, but only if I need to remove the cup.
I'm all for safety, in fact I'm about the most critical person about safety in my work and at home, but there is no need to keep on telling myths and giving false information that make people unnecessarily scared (which is actually endangering them).