Jeremy said it would be fine
Look for another tutorial. This kind of tips could kill your computer 
when attempting to measure the amperage on my multimeter I found the value started really high and then continuously lowered until around 300mA
How did you connect your multimeter? Please provide a hand-drawn schematic or a photo. Seems you are shorting the port with your multimeter. Read about how to use a multimeter to measure current.
How does the circuit know to only use 20mA with 150 Ohms resistance when there is 5A to play with on the USB C port?
How does your ceiling light know to only draw 100W from the power plant providing several Gigawatts? Read about Ohm's law.