I noticed that Del doesn't work on Reach Strikes, and it also doesn't prevent stuns from bash/ram.  

Not sure if that is intended, but if you notice..reg stuns it works, and normal 'Front' strikes from polearms/2h swords it works.

Hi,

no it works okay. The delirium does not prevent from being pushed. And the push into solid object results into the stun which is not considered as a normal status effect, thus it gets not negated.

Also the 'weapon long reach' is not considered "normal damage" and so it also is not negated.