then get an overwhelming majority in parliament
And also control the senate, right?
Senators are elected indirectly by approximately 150,000 officials, known as the grands électeurs, including regional councillors, department councillors, mayors, municipal councillors in large communes, as well as members of the National Assembly. However, 90% of the electors are delegates appointed by councillors. This system introduces a bias in the composition of the Senate favoring rural areas. As a consequence, while the political majority changes frequently in the National Assembly, the Senate has remained politically right, with one brief exception, since the foundation of the Fifth Republic, much to the displeasure of the Socialists.
The evidence for this is really poor, the entire field of the hormonal theory of sexuality (and gender) is garbage
There's lots of good literature on transmedicalism
Anyway someone who subscribed to that theory would say that a micropenis would be consistent with low fetal testerone and this story would be readily believable by them - far more than a trans woman who was born with a macropenis.