Yes, FR24 uses satellite data from the SPIRE nano satellites and supposedly expects to be able to post a position report every 15 minutes or so for most aircraft. Their satellites have far less coverage than Aireon, with huge gaps, but their data was made available for free in March 2020. Looking at the tracks for LAN1201 and LAN1164 on multiview on FR24 it is clear that in reality there is no coverage for multiple hours at a time at those southerly latitudes. Aireon has a far better offering.
