I can't tell you how many of these videos I have seen where baking soda and vinegar is used to clean pet urine stains on all types of surfaces. As a pet urine odor removal specialist, which means I do it for a living in Tampa FL, I can tell you that this DYI remedy does not work. vinegar and baking soda make a lovely chemical reaction that releases carbon dioxide and water but that's it. There is nothing in this reaction that neutralizes urine crystals.
If you have a wet urine deposit on tile and grout it can be cleaned just as effectively with water and a few drops of dish soap. There is no need to mix a volcanic solution of baking soda and vinegar. The video gets the first step correct. Clean the urine deposit up with a paper towel. Then mix a cup of room temperature tap water with 5 drops of dish soap. Sponge it onto the spot where the urine was deposited and then wipe it up with a another paper towel. That's it. You will get the same result. I do recommend spraying some Lysol or other sanitizing spray on the tile to kill any associated bacteria that may be on the tile. It's much more effective than vinegar and has a pleasant smell as well. If you find an older dried spot of urine on the tile you might want to contact a pet urine odor removal specialist to see if more aggressive solution is needed.