This is good news. It's a very useful database for transportation planners and others!!
I think the challenge will be how to use the single-year ACS data, 2016 through 2020, in combination with the five-year 2016-2020, to simulate a full set of flows for each single year: 2016, 2017, 2018, 2019, 2020 AND 2021.
2020 will be most problemsome given it's only available as a dataset with experimental weights.