An argument is valid if its conclusion is logically entailed by its premises and each step in the argument is logical. Which was the case in Kelin's argument, as his premise was a fastrelog-free server.
If an argument is not pertinent, it is automatically invalid. Protip: look at the name of this thread.
Not at all, in fact it makes my argument even more dramatic, because one lvl 99 with +hp +ap +dr will kill all fastrelogging lvl 24 alts.
Let's look at the lvl99 character from your picture:
BG, 432 hit points, 16 action points, 6% crit. chance.
Now let's compare that to the stats of ONE of my lvl24 chars (and remember that I have EIGHTEEN of them):
Sniper, 164 hit points, 12 action points, 35% crit. chance.
Now tell me, what makes you think that the lvl99 BG will be more problematic to me than a lvl24 BG (~240 hps, 14AP)? Because of these additional hit points? Dude... I will have AT LEAST 18 chances to instakill him OR serve him a chain of knock-downs combined with bypasses here and there no doubt, blind him, cripple his arms so he won't even have a chance to use his weapon, etc. In theory, he has an advantage over me, but the advantage is not even near to game-breaking. Sure, he has a very high normal damage resistance, but it's not going to matter if I play my cards right.
Things might be different if there are more people than just me and him involved in the fight, but at the end of the day his power will be equal to about one and a half lvl24 BG chars AT MOST.