Baking a GPU is temp fix AT best, and everyone oven is different in temps, hot spots, etc. I wouldn't have done it upside down as gravity would pull parts out, exactly what happened.
Basically, all electronics nowadays have lead-free solder. This is so when old electronics go to die, they end up in a landfill and the lead doesn't leech back into the water table, etc. The problem is, lead-free solder sort of sucks. It can break easily under heat stress, it develops what are know as "tin whiskers", etc. When this happens, you can either remove the chip and replace the solder balls using a stencil and lead or more lead-free solder, or try a reflow, which is to drench the chip in flux, and then heat it up so the cracks could seal up, the tin whiskers would get sucked back into the balls, etc. Most lead-free solder used in electronics starts to melt and become liquid at 217 degrees. EXACTLY. You can heat it to about 222-224 degrees and that's it. You keep the heat at that temp applied for about 20 seconds, which is called the dwell time. Then you let it cool. This is what causes no-video on laptops, the Red Ring of Death on the 360's, the Yellow Light of Death on the PS3's and most electronic failure involving BGA chips. I have fixed thousands of laptops, 360's, PS3's, TV circuits, etc, all using a professional reflow machine that costs me about $2000 plus supplies.
Now, people who don't have a computer controlled temperature monitored reflow machine, think, heat, oven, toaster oven, hair dryer, paint stripper, etc, can do the same thing. It can't. My machine slows ramps up the top and bottom temps of the board and monitors the temp of the chip itself to eventually get to 217-222 degrees for 20-30 seconds, then stops. An oven doesn't. A paint stripper doesn't. None of the "youtube" fixes do. It's almost impossible to put a board in the oven and keep it at EXACTLY 217-222 degrees. Oven/toaster oven/paint stripper fixes usually fail. It heats up the chip, but in no way, shape or form, does it "reflow" the solder to becoming pure liquid solder.
Considering you heated up your card enough to get all the solder liquid to the point that caps are falling out, you probably hit way hotter temps than the 217-222 window, and probably toasted the GPU itself, if not other components.
Sadly, YouTube is not the pinnacle of human knowledge, just people with a camera.