Questioning MAMI's recent determination of $B_{\Lambda}({_{\Lambda}^3}{\rm H})$

A recent report on ${^7{\rm Li}}(e,e'K^+)$ electroproduction runs by the A1 collaboration at the Mainz Microtron (MAMI) assigns a sharp pion-momentum line at $p_{\pi^-}\approx 113.8\pm 0.1$ MeV/c to ${_{\Lambda}^3}{\rm H}\to\pi^-+{^3{\rm He}}$ weak decay, resulting in exceptionally large ${_{\Lambda}^3}{\rm H}$ binding-energy $B_{\Lambda}({_{\Lambda}^3}{\rm H})=0.523\pm 0.013\pm 0.075$ MeV. Here I suggest an alternative interpretation of the observed sharp line in terms of ${_{\Lambda}^7}{\rm He}_{\rm g.s.}\to\pi^-+{^7{\rm Li}}(E_{\rm x}=478$ keV) weak decay, discussing also the model dependence of $B_{\Lambda}({_{\Lambda}^7}{\rm He})$.