Here’s the full write-up: matthewhockert.github.io/st-paul-taxes/

The idea isn't legally possible but is an exercise to show how vacant land contributes far less to the tax base than developed parcels and how fee structures could change incentives.

Is anyone tracking to see how many projects have been completed or cancelled?

Your argument is also found in the data. Placing transit access to jobs over the LRT lines shows that they may have increased access when they were built but it's still not good especially when you compare it to cars.
arcg.is/nvPjD1