@Devon Rollison To me, a Proof of Funds (POF) is just something showing you have all the funds necessary to close the sale in your name (the buyer).
Could be a copy of your bank statement, or something much less formal like a screenshot of your account balance from your bank website (that’s what I normally use).
You actually appear to be planning to finance your purchase. So, in that scenario, you'd normally use a pre-approval letter (not a POF) showing you've already applied with a lender and are a qualified buyer because you've already been approved for a loan by that lender.
What you've shown in the screenshot above is neither of those things. It's not a POF in your name, and it's not a pre-approval letter. In fact, any Realtor that Googles it will see it's something that DoHardMoney sells for $50 and it's not a guarantee of anything. It actually says right on their websites that these letters "in no way indicate that you have been approved for a loan".
A Realtor (knowing that) is not likely to take that letter seriously or allow their client’s property to be tied up by a buyer who presents such a letter.
If you don't actually have real POF and you don't actually want to get pre-approved with a lender, then you should focus on off-market properties.
Properties listed with a Realtor on the MLS don't tend to make good wholesale properties.