If my article submission is rejected while my PhD thesis is being examined, do I have to tell the examiners?
The acceptance of a paper is not something that you are obligated to raise to the members of your thesis committee, because it is not a part of the evaluation of the thesis—it has to be considered on its own merits.

That said, if you are asked about or choose to inform them of the status of the manuscripts, you should not lie about its status.