In point of fact, multiple sources say that the Guinness listing is simply for "most game show episodes hosted by the same presenter".
I'm assuming they didn't count the daytime Wheel eps because Sajak didn't host the entire run of it, and the record was for a single presenter. (excluding special programs like April Fools Day or being out because of illness).
I think this is something that should be explored. The daytime version is very confusing. It was hosted by four different people. Jeopardy's been pretty cut and dry with no extended period of time without Trebek at the helm.
I think "Most Game Show Episodes Hosted By The Same Presenter" is probably the shortest thing they could put in the book without it being "Most Game Show Episodes in Single Incarnation of Series Hosted By The Same Presenter Not Counting Specials." I have to imagine that there are other criteria they're using to determine this.
Either that or they're just too lazy to calculate the information across the two Wheel series. I wouldn't be surprised if that's the reason.