Do EX Primals really have a better card drop rate?

[DoctorPepper]

Recently I've been seeing an awful lot of people claiming that EX primals have a better drop rate than HM primals and I'm trying to figure out if this is an actual fact or just rumored assumptions coming from players because EX are harder.

Can anybody point me towards some actual data with a decent sample size showing that the EX primals have a better drop rate or did I miss a dev mentioning this somewhere?

The reason I'm skeptical is because I haven't gotten a card from an EX primal after over 30 wins. I also have a number of friends with a similar amount of wins and no cards to show for it. I understand 30 wins is a relatively small sample size and doesn't prove anything aside from bad luck however so I'm just wondering why everybody is coming to the conclusion that EX primals have a better drop rate?

If you're going to answer, please leave your assumptions out of this. I'm not looking for a debate, I'm looking for real data or dev posts. I'm not saying the drop rates aren't better, simply looking for evidence.