On the day of baptism the candidate has to publicly answer ‘yes’ to these two questions
1) “Have you repented of your sins, dedicated yourself to Jehovah, and accepted his way of salvation through Jesus Christ?”
(2) “Do you understand that your baptism identifies you as one of Jehovah’s Witnesses in association with Jehovah’s organization?””
I believe they would not be able to answer question 2 , if they did not accept 1914 etc.
Also, if the person claims to not accept the chronology used, then no elder would sanction their baptism