filter-row demo is broken?

[elvisqi]

https://fin-hypergrid.github.io/core/demo/filter-row.html

filter-row.html:21 Uncaught TypeError: Cannot read property 'extend' of undefined
at window.onload (filter-row.html:21)

fin.Hypergrid.dataModels.DataModel.extend is undefined

fin.Hypergrid.dataModels only has property "HeaderSubgrid", renamed it?