that seems to be the conclusion. But there are sources for every calculation they made and I couldn't find a more immediate comparison than this.
I ride bike and more rarely foot. I own nothing electric or combustion for transport and I am willing to bet that the impact of electric (personal) will be worse than that of internal combustion engines.
But in all this I don't know how to evaluate my impact (from the food point of view) to move by bike and I don't think it's negligible.