Knowledge only becomes toxic in the hands of those who wield it to benefit themselves.
Bad habits and biases can only be changed if one is open to the possibility.
When is knowledge toxic? This may be true if the knowledge about let's say a customer reveals facts that the customer does not wish us to know. This is typically referred to as toxic knowledge. Such knowledge is frequently used, if dealing with competitors. Some competitors may reveal to a customers some toxic knowledge pertaining to the business practices or financial security of a competitor. I have seen this scenario used many times by competitors. It may be fresh, but it is not clean, but in business, what is clean? Especially if it works.
Toxic or good knowledge depends on application at different stages where: we don't know what we don't know, we don't know what we know but have a try, we know but not expert yet, and we know exactly what we know and excel. At last stage we are able to judge and argue about it constructively and make good decision.