Yeah, that partner thing is sort of an early understanding of what was going on too. They used to worry more about primapaternity - first exposure to the partner - until the data came out showing that the problem was more likely exposure to a partner carrying HLA-C, which is to say a lot of people. The problem is really that we're making babies with other humans.
On top of that, a lot of women develop preeclampsia because of underlying predispositions to overreact to pregnancy inflammation, and partner specifics won't matter so much for them - and the rest of us would benefit from spiral artery remodeling regardless.
Here's a link to the most recent abstract I can find on these topics
. It says The risk of recurrent preeclampsia is inversely related to gestational age at the first delivery: 38.6% for 28 weeks' gestation or earlier, 29.1% for 29-32 weeks, 21.9% for 33-36 weeks, and 12.9% for 37 weeks or more. The recurrent preeclampsia risk was fairly constant if both births occurred within 7 years. Obese and overweight women had higher risks of recurrent preeclampsia (19.3% and 14.2%), compared with women with normal BMI (11.2%). The recurrence risk did not differ according to paternity status.