GLS power and signal semi-amplitude as a function of the number of data for the 11.44 d periodicity, supposed to be induced by a close-in super-Earth planet GJ 15 Ab. The magenta vertical line separates the pre- and post-discovery HIRES data for GJ 15 A, while the red line indicates the beginning of the CARMENES data. Even before the claimed planet discovery, the pre-discovery HIRES data seem to show fading power and semi-amplitude of the signal, and this continues when adding the newly published HIRES data. The descending trend of the power continues when the CARMENES data are added, which by themselves are not consistent with a periodic signal at 11.44 d.