None of the synthesized peptidomimetics were able to completely inhibit infection of authentic SARS-CoV-2 (strains 20A.EU2 and Delta) in human glioblastoma U87.ACE+ cells or in human lung epithelial A549.ACE2.TMPRSS2+ cells up to 50 μM concentrations. This evidence concerns the gene TMPRSS2 and glioblastoma.