Try this code:
import Metashape
chunk = Metashape.app.document.chunk
T = chunk.transform.matrix
m = chunk.crs.localframe(T.mulp(camera.center))
for camera in chunk.cameras:
R = (m * T * camera.transform * Metashape.Matrix().Diag([1, -1, -1, 1])).rotation()
estimated_ypr = Metashape.utils.mat2ypr(R)
if abs(estimated_ypr[1]) > 10:
camera.enabled = False
else:
camera.enabled = True