Answer for retired-chemical-engineer-manager-of-engineering-for-major-oil-company

Yes, it is possible that your ISP is throttling some video streaming sources as well as possibly bolstering Netflix.  However, Netflix has a vast global content delivery network to reduce latency.  Meanwhile, servers that you stream on Kodi are typically a single server somewhere.
 
But, if you think it might be ISP throttling, you might want to try using a VPN.