The arXiv preprint from Hotinli et al. (2026) reports the first claimed detection of the moving lens effect—a secondary CMB anisotropy from transverse gravitational potential motion—via a Fourier-space cross-spectrum estimator applied to ACT DR6 temperature maps and luminous red galaxies from DESI Legacy Surveys. Their analysis yields amplitudes of b_ML = 1.24 ± 0.26 (4.8σ) in the extended sample and 0.93 ± 0.25 (3.7σ) in the main sample, consistent with halo-model expectations. This preprint methodology relies on scale-separated velocity reconstruction to suppress foregrounds, with curl-mode null tests below 2σ and multi-frequency checks supporting low contamination. Yet mainstream coverage overlooks how this transverse velocity probe complements radial kSZ measurements to reconstruct full 3D peculiar velocities, potentially tightening constraints on structure growth rate fσ8 beyond current redshift-space distortion limits. Earlier non-detections, such as those in Planck-based searches, stemmed from insufficient scale separation; ACT-DESI's approach reveals this as a key oversight. When synthesized with ACT's prior kSZ stacking results (e.g., 2020 ApJ papers on galaxy clusters) and DESI's BAO analyses, the signal hints at new tests for gravity deviations on scales >100 Mpc, where dark matter halo velocities could expose modified gravity signatures missed by lensing or clustering alone. Limitations include the preprint status, unquantified sample variance in galaxy tracers (~millions but not volume-complete), and reliance on simulations for foreground bounds rather than direct data splits. This opens overlooked paths to mapping velocity fields for dark energy evolution studies.