I assume that after all these years that any plausible argument to double check that Hazza is Charles’s natural son is long resolved.
So I anticipate that should any concerns about succession arise, a highly discreet DNA sampling will be arranged to test if Archie & Doriana are Hazza’s natural children. Likewise, tests to confirm their maternal DNA. Given the relative advancement of assisted reproduction technologies & practices, there is still no absolute guarantee that frozen eggs can be fertilised as well as a freshly harvested egg.
It is re’markle’ that a woman of her age has been able to conceive several times over with such rapid ease - some people might think almost to schedule - & carry twice fully to term in under 3 years.
Could be that MM is one of the lucky ones when it comes to fertility in the late 30s.
BTW for those about to pipe up about those they know who were just as fertile, please pause to consider that there are many more who have not been so fortunate & do not comment. Across the board, medical specialists repeated advice women not to rely upon robust fertility after their mid30s - that is the point. MM would not be the first woman to use IVF to get pregnant promptly after deciding to start her family in her mid30s - entirely plausible.
This is where Markles has tripped up. How much easier it would been for here if she accepted the care of the Royal Medics & the usual protocols around the royal birth followed. Not a red flag to be seen.