There is to my knowledge no book called "Total Operations". There is, however, Tactical Operations, which a distinct volume from the core Total Warfare one. So maybe some of the confusion stems from that?
And anyway, yes, X-pulse lasers can be found in TacOps. Page 321, to be precise, with all the relevant numerical performance and construction data in the tables on pp. 406-409 (the small X-pulse is right at the bottom of one double page, the medium and large one at the top of the next).