I don't know enough about housing data myself, but the link in my post details the calculations. The concession is made that there are limitations to HDMA data, and data from CoreLogic is used to supplement the process. GSE's don't approve or decline mortgage loan applications but lenders do sell the loans they make to GSEs in order to maintain liquidity. GSEs have their own lending standards which need to be met before they accept the loan and this is what is scrutinized here. Again, the article has more details if you are interested.
Housing data has nothing to do with this. It's about lending, not housing.
You took a blog and ran with it. As I guessed, you don't understand the subject.
First off, the purpose of the MBA report was because the MBA - a lobbying group - desires to get the government (GSEs) out of the mortgage lending business, and bring private investors on the secondary market back into it. The MBA received pushback and claims that removing the GSEs from the mix would hurt minorities. The MBA's data was to show that even with the GSEs, minorities are still having their applications denied at a high rate - and by the way, the MBA wasn't implying any kind of racism.
Second, CoreLogic is a subscription based repository of general HMDA information. There are no limitations to the FFIEC's management of HMDA data. And not all banks and credit unions are HMDA reportable so the reality is that the true picture is impossible to capture. CoreLogic's data is primarily coming from the country's largest lenders and is not representative of the lending in this country as a whole
Third, the data is not for "scrutinizing the GSE standards", which I am very familiar with for professional reasons. Not all loans are sold to the GSEs, although most mortgages are written to Fannie and Freddie standards.
Fourth, lenders can only report to the FFIEC the information that is willingly provided to them by the applicants. Applicants have the legal right to decline identifying their sex, age and ethnicity. When applications are taken online (FI website, Mortgagebot, Data-Vision, etc.) there is a very high probability that the applicant declines to provide this information and the underwriter has no way of knowing the ethnicity of the applicant to deny based on "race".
Fifth, HMDA data is examined thoroughly and if there are trends that show up in a financial institution's data, they will be further scrutinized, and penalties include fines, public relations nightmares, and potential loss of charter.
Most importantly, mortgage underwriters don't indiscriminately deny loans to applicants because they're black. That's why Reg C exists. There are many reasons why mortgage loan applications are declined, and color isn't one of them.
Blogs like the one you posted are dangerous. It gives people a very small piece of selective information that sends them off thinking something that isn't true.