CircleCI folder in dtest is confusing

I made a patch to dtest without affecting Cassandra. cassandra-dtest repo contains folder with CircleCI configuration file. So I tried to run a build from CircleCI and it failed with an error related to configuration:

ERROR: flake8 3.9.2 has requirement pycodestyle<2.8.0,>=2.7.0, but you'll have pycodestyle 2.3.1 which is incompatible.

The CircleCI config contains

sudo pip install pycodestyle==2.3.1 flake8

, so it should lead to the error.

From the discussion in community I learned that dtest are run as part of Cassandra build and not on cassandra-dtest directly. Is the config in dtest maintained? If not, it might be good to remove. Or may be add some comment about it.