Is it this one: https://kksb-cases.com/products/digital-tuner-dvb-t-och-t2-tv-uhat-for-raspberry-pi-sony-cxd2880-network-streaming ?
In that case it appears that it is DVB-T/T2 only. I am not familiar with "ISDB-T", but many sticks support both DVB-T and DVB-C and many of them can be bought cheap on eBay. Problem is that sticks that look the same, might not always have the same chipsets.
Generally the "Astrometa" style sticks should work.