1) Padmavati and all that issue was during 1303-1310 period (not sure exact year). After 200-300 yrs her first name was mentioned by one poet Malik Muhammad Jayasi through a poem . Some say its just an imaginary thing by the Poet, and some say NO she was real.
2) Don't know if movie postponed by external pressures before too or not.
3) Some say that there were too many movies for CBFC to censor so wont happen soon for Padmavati.
Some say due to political pressure they arent taking the film by delaying with some reasons.
Some say CBFC members were pissedof by SLB as he showed the film to few anchors even before CBFC team, so they are delaying.
4) It can be like, If I (SLB) show the movie to Rajputs then the controversy will die down which actually helped alot for the movie for initials. So that can also be the reason ki i wont show despite I (SLB) know there isnt anything wrong in the film.