Fairly little. Decentralization should take into account how redundant our nodes are, as opposed to how many nodes are there. I suppose it wouldn't matter that much if there are tons of nodes in certain areas or datacenter.

Whilst it is great that they're able to include a container image for this, it isn't difficult to run a few commands to download Bitcoin Core. If you have to update Bitcoin Core in the near future, you would also have to do it yourself.