Any spectrograph measurement, using diffraction gratings (>2000gr/mm), shows exactly the radiation solar spectrum, no matter if you think FE or RE, the Sun doesn't change. The analysis points to Hydrogen fusion into Helium, releasing energy, no matter what. So, FE Sun is a Hydrogen Fusion Reactor, but considering its tinny small size of only 30km in diameter, it is totally impossible to accumulate enough gas to promote such pressure and temperature necessary to ignite the fusion process. Not even considering that gravity doesn't exist in the FE world, any gas would disperse in vaccuum. In the real universe, not even Jupiter could do it, with a diameter of 142984km, 4766 times larger diameter than the 30km FE Sun) composed with 90% hydrogen, mass equivalent to 318 Earths. The smallest Red Dwarf star, is 80 times bigger than Jupiter, so it needs to pack another 79 Jupiters into the actual one for it to have a narrow chance to ignite fusion and become a star. We are talking about 381000 times larger than the FE Sun.
Want to make a comparison? Think about a 1/2" (12.7mm) small glass marble as being the FE Sun, now, 12.7mm x 381000 = 3.024 miles, that is the equivalent diameter of more than
650 city blocks put together to form a 3 miles diameter circular area (do you want me to post the calculation?), or the equivalent to 519,841,729 US school buses piled into a huge ball, and that is the smallest Red Dwarf known to be able to ignite. Do you really think a tinny glass marble 1/2" in diameter will ignite fusion?
US total yellow school buses in 2015/2016: 474194. It would be necessary 1096 times the entire US school bus fleet to build such 3 miles diameter ball, just to make a small Red Dwarf ignite as a star, when compared to the size of FE Sun as a small 1/2" marble. Think again.
https://files.schoolbusfleet.com/stats/SBFFB18StateByState.pdfA regular US school bus is 2.6m wide, 13.7m long, 3.2m high, 114m
3A 3 miles diameter ball has a volume (V=1.33*PI*R*R*R) 5.92 E+10m
3 Below the solar spectrograph, with the black absortion lines showing its radiation and gases composition.