Yes, this is a typical AI error. The error lies here:

steem = Steem(nodes=["https://api.steemitdev.com"])

With beem you can only pass the nodes with the parameter node=[].
If node is not specified, the standard nodes are used. Apparently only those from Hive. I can't check that now.
Please use this line:

steem = Steem(node=["https://api.steemitdev.com"])