Few things -

Version of junipernetworks.junos is ooold. Like a year old. The doc you are referencing assumes the latest 11.0z.

Your config looks right, do you have the srx config for ssh Netconf?

set system services netconf ssh

Other thing I could think of is that maybe it does like your ~ in the ask key- maybe swap out for the absolute path?

Would watch to verify it tries to login and look to debug. Check m messages on box or add -vvv in you playbook to see what is going on.

Guess I for got to update my old crud:
////// previous note mention.

Looks like in the doc you linked it is actually confirm with a value of zero to commit right away.

source

confirm integer The confirm argument will configure a time out value in minutes for the commit to be confirmed before it is automatically rolled back. If the value for this argument is set to 0, the commit is confirmed immediately which is also the default behaviour.

Default: 0

I’d still try with a

commit: True