Slow movement is sort of bad, but like you say yourself in your article (not read it but I assume it describes what you say it does) there are ways to largely compensate that.
Haste, however, is a 50% power boost to any character for zero investment (consumables) or little investment (10-12 charms for many light-armoured chars). Cheibriados, in other words, forbids you making your character 50% better, which is something any other character desires to do (some have problems - off the top of my head, only MuBe comes to mind). So to even be as good as an atheist char(!) Cheibriados would have to make your character 50% stronger otherwise. This is a rather high claim to make, but I don't have numbers here so in dubito pro reo. However, one could also pick another god who not only makes you a lot stronger than an atheist char (unlike Chei), but who also gives much better powers than Chei even if he didn't prevent Haste.
In other words, if we say "Chei makes you 50% stronger" to argue in favour of Haste not being worth it, which I don't agree with, we have to also say "Kikubaaqudgha makes you even stronger", "Makhleb makes you even stronger", "Elyvilon makes you even stronger", etc. etc. for most of the pantheon because their powers are simply better. Chei is left with a bunch of powers that sort of compensate for his weaknesses, many other gods don't give you any weaknesses and also have much better powers in addition to that.
So yeah, wrong, sorry. This is probably because of
I did never get very far with Chei
because not many characters early on have Haste available in an often-usable way, such as many potions, a wand, or simply the spell itself.
EDIT: read the article, it had the important items but contained two or three bits of misinformation. I improved it. Also, OpMo of Chei isn't exactly a good combo, though constriction does benefit from him. See above. I wouldn't make a character guide for OpMo featuring Cheibriados.