R² is 0.50: a reasonably reliable fit; the betas and the split below are worth reading at face value.
Note: the net move here (+16.6pp) is small relative to the systematic and idiosyncratic swings underneath it; they're largely offsetting each other, which is why the idiosyncratic share below exceeds 100% (it's dividing by a small net, not an error). Read the pp values themselves as the meaningful numbers here, not the ratio.
Of TSLA's +16.6pp move over this window, -28.5pp (172% of the total magnitude) is idiosyncratic, not explained by riding market, sector, or rate moves. The rest (+45.1pp) came from systematic exposure: market +45.4pp, sector -2.0pp, rate +1.8pp.