Essentially zero actual economists assert or believe that actual humans in actual economies are, or behave like, homo economicus. Essentially all are aware that

Essentially zero actual economists assert or believe that actual humans in actual economies are, or behave like, homo economicus. Essentially all are aware that it is a limited model, which attempts to approach certain important features of reality, but cannot always do so due to limits on information, comprehension, and subjective values. Meteorology is still a valid field of science even if its models are limited and incomplete. Likewise with economics. "Economists think homo economicus is literally true" is a ludicrous strawman.