As a native UK English speaker, former TEFLA trainer and a translator and proof-reader/editor of business and scientific/academic texts for the past two decades, I strongly disagree with the initial sentence. The expression "as per" is simply a different register from "according to", and the term is widely used in commerce.

Insofar as the answer refers to the two sample sentences: (As per my knowledge it is right /According to my knowledge it is right), I would tend to agree. However, as regards the general usage and difference between "as per" and "according to", I would disagree. The expression "as per" is simply a different register from "according to", and both terms are widely used in commercial and legal documents.