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As mentioned in the comments, setting the node name argument will set the name of all nodes created by the node as well. The issue is that, if you look in the source of the Node() class, setting the name argument is essentially equivalent to using --ros-args --remap __node:=<new_name>.This remapping seems to hold for all nodes generated by the node itself as they are within the scope of the original remap.

Whether that's by design or its an unintended "feature", I'm not entirely sure, but I've seen the same misuse of the name remap in a number of packages now and I think the current implementation is pretty non-intuitive. In any case, I think most people would be better off using either namespaces with default node names, or using node composition