Today on the base people have been confused if sasuke has tsukyomi the answer is yes he has a powerful genjutsu, that comes from his mangekyou sharingan but in his ms days it was not as powerful as tsukyomi lets break down the brothers here itachi is highly skilled in genjutsu it came very simple to him sasuke is highly skilled in ninjutsu (chidori variants katons at a young age) therefore gaining MS amplified the brothers power tremendously in there respected field i believe you gain one ninjutsu and one genjutsu from the mangekyou sharingan being brothers and seeing as itachi gave sasuke ALL his eye techniques they have the same moves amatertsu and tsukiyomi now itachi has a very low version of blaze release which means he is able to stop the fire from burning when its said to be impossible so its just regular amatetsu not enton but he can't control the flames shape. So now flip the coin sasuke can use a genjutsu capable of learning information or paralyzing his opponents but he cant contol that persons perception of time so its just a regular genjutsu not tsukiyomi BUT by gaining ems he now has tsukyomi becasue the powers of their eyes is now combined you should also note that sasuke and itachi have different sussanos due to their different specialties and from gaining ems instead of having one long nose the final form of sasukes sussano has two making it seem like they have been combined i hope this helped!