0) Politics is a messy, confusing affair, even by-nature (if you will). I would take such lineage claims with a generous pinch of salt ;)

1) the Ancient world was gravely brutal. Sex, Pregnancy and Fighting were more often used synonyms than most may realize today. Hard to tell how many children Mark Anthony knew he himself 'fathered', let alone us today. Slavery and serfdom was rife in/around Europe up to 1400s, and in parts up to as late as mid-1800s!

2) Bolsheviks were ruthless in removing the Tsar+family + opposition. it's highly unlikely they would've been so lean on such famous linage from little ancient Rome; they were full of paranoia.

Article's a great read though.