308 air filter chip

Today I went to the special Peugeot service to replace my car's air filter. The master disassembled the air filter and showed it inside the hose to the filter. See if you can see the chip here. It was dusty. He said, let me clean it with a spray. I said okay. Then he said, connect it to the computer and install software. He said fuel consumption is reduced by 15%. The chip it showed was adjusting the air intake rate. I didn't understand how to install software on that chip. He said about 100 TL. Because it didn't sleep much on my head. I couldn't believe that chip was so effective. I'll say okay if he does something about the car's brain.

What is this chip? Does it really have an effect on fuel?

It's the air flow meter. If there is really dust, it is useful to clean it.
If it was up to me, the software did some work.