Work history in application is historical information. It does not change. (It may be different than that reported, in which case it is subject to correction, but that is not because the work history changed, it is because it had errors.)
Address history, likewise. Travel history, likewise. Historical. These are reported for the eligibility period. As of the date the application is made that is historical, past tense information. The past does not change (even though our accounts of it might).
Current residential address, that is something which can change. If that changes, if the applicant moves to live in a different dwelling place, the applicant has an obligation to timely inform IRCC of this.
Events or circumstances related to prohibitions include present tense declarations, like "are you on probation?" or "do you have criminal charges pending?" The response to these and other parts of item 16 can change and thus, likewise, if they do (say the applicant is arrested on domestic violence charges the night before the oath ceremony) the applicant is obligated to promptly notify IRCC of this (failure to disclose being charged with a crime while the application is in process, even just the day before the oath, is perhaps the most likely misrepresentation to be prosecuted as a misrepresentation, sooner or later).
The applicant may, however, be asked questions about current employment during the interview. (This, so far as I have discerned, is actually one of the more common interview questions, along the lines: "are you employed?" or "are you still employed," or "where do you work?")