Can sterile neutrinos explain the very high energy photons from GRB221009A?

The LHAASO Collaboration has reported their observation of very high energy photons (${E}_{\ensuremath{\gamma}}^{\mathrm{max}}\ensuremath{\simeq}18\text{ }\text{ }\mathrm{TeV}$) from the gamma-ray burst GRB221009A. sterile neutrino that involves both mixing and a transition magnetic moment may be viable explanation for these photon events. However, we demonstrate such solution is strongly disfavored by cosmic microwave background big bang nucleosynthesis in standard cosmology.