Oncidium(?) - tiny black spots on pseudobulb and leaves

[Orion]

Hello,

A friend has asked me to look at an orchid which is not doing so well here.

I suspect it is a Oncidium but I am not certain, and there are these tiny black dots that appear on the pseudobulbs and the back side of the leaves. The dots on the pseudobulbs don't seem to have caused any change in texture, and the dots on the leaves are a bit sunken.

I have not encountered this before, is this likely caused by fungal growth?

Thank you for your help.