Divine Barrier removes Lash Ult Death Slam ropes, but does not stop the actual lockon.

[SuperMatter]

Using Divine Barrier on an ally being targeted by Lash's ultimate will remove the visual ropes latching on, but Lash will continue to be able to ult the ally normally. This occurs regardless of whether you do it while the lockon is fully charged or not.
In the attached clip I have the mirage self-casting Divine Barrier to purge the ropes.

View attachment Deadlock 2025.07.28 - 18.56.16.02.mp4

 

[Hyperbus]

it is a channeled ability, just like warden or dynamo ult.