Yes! I've got the Automatic Magnetic Loop Tuner's project code running on an Teensy 4.0. So far everything seems to work fine, but more tests are needed to be conclusive. The ADC of the Teensy 4.0 only has 10 bits compared to 12 bits of the Teensy 3.2. I still need to find out if this loss of precision is in issue or not, and if it needs to be tackled further in the software.
Next up is a redesign of the PCB and make sure all inputs do not exceed 3.3V... Stay tuned.