On the official website all links to the models in model zoo (and on github) refer to data.dmlc.ml. DMLC also have their own github with models. Number of models from official website and from DMLC is slightly differ (e.g. squeezenet v1.1 on official website and squeezenet v1.0 on DMLC).
Can models from DMLC be considered officially supported?
Yes, you can consider them well supported. If they are not working, it is worth of posting it here.
Also, if you are looking for a specific model for Computer Vision or Natural Language Processing, please, consider looking into the following model zoo as well:
Also ONNX is supported format, so also consider https://github.com/onnx/model-zoo if you haven’t found what you need in previous places.