blinking lights after battery change

Evening!
My partner just got a battery changed on an '03 tundra and after getting it back from the shop, the seatbelt light, door warning light, many cabin lights, the LED in the ring around the ignition, the gauge cluster, outboard signal lights, and the security system red LED are all flashing in sync.
What the hell? Any ideas for fixes?

 

My first question is who changed it. I don't know what would happen if the installer reversed polarity, but I've changed my 2001 3 or 4 times over the last 25 years and have never had a hiccup. I would start with the shop that replaced the battery. Maybe it's something simple and easily fixed. Got my fingers crossed for you.