Prokion said in this thread that manik engine is used for this but I guess he's referring to the testbed.
If they are using Kaveri eventually that makes more sense. Kaveri program has not finished development and India wants France to either complete Kaveri program for India or simply use M88 for everything that Kaveri was intended to be used for, where permitted.
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So basically to summarize this program, it is at the 1:10 model testbed where even though none of the planned avionics are ready and being used on this testbed, they still pretend to have antennas everywhere despite it not even being a prototype. I don't know why they would put fake antennas on something that is a very small scaled "testbed" where the antennas required would still be unknown for the eventual prototype which isn't even developed. Also no idea what the purpose of taxiing test is for a testbed that is so scaled down to show off as if it's some sort of prototype which it is certainly not.
What India has here is a RC plane testing the aerodynamics, with no intended weapons suite or sensors suite developed at all... not even a prototype or even a flying testbed and Prokion is telling Pakistan to cry. Lol.