I'm not sure if the second part was an actual text? The part about dinner and what casual mean to you?
Just to me, personally, the phrasing seems clunky to me and is pretty much unnecessary...but that's just my opinion and I am basing it on things I would text.
Casual to me means there is no pressure for it to be a regular thing, we just hang out and fvck at times. Every once in a while we go out and do things. But it isn't some regular thing where there are any expectations for more...like meeting up x number of times a week, meeting family, progressing things from a more superficial level and getting deeper, etc.
Also means there is likely going to be an expiration date on this as women are only good with it for so long.