I was initially under the impression that they did, but upon better reading the description of the passives I’m not sure anymore.
Volatile Blood, for example, is worded as follow:
Important to note that Reaper Form description emphasizes that the health it drains is not based on your maximum nor on your current health - so it’s not a percentage.
Edit: Made some tests with respec and video recording, and indeed they do not affect Reaper Form.