filter-row demo is broken?

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?