This is simply innovation; it is based on personal opinions and has not supported in the authentic sources of Islam or sound fiqh. Islamic prescriptions are not based on whims and fancies of people; rather they are based on sound proofs and inferences from them.
Therefore, you are best advised to disregard this opinion. On the proper method of istikharah you may read the answer linked below.
Let me also advise you not to seek Islamic advice on those who base it on their own subjective feelings and opinions.