You did actually read the thread you shared, which is fully of people saying “lul wut” and recommended that the shop be reported for poor business practices? One, isolated shop trying to welsh out of honouring a warranty does not a pattern make, I’m afraid.
Also why did you post a link to a BIOS download page for a random motherboard manufacturer? Just plain confused by this.
My advice to OP remains the same - update the BIOS, especially on a new machine. Check with the supplier if you are worried about warranty, but it won’t be a problem.