Welcome to the forum.
The manufacturer's page of the flow sensor: https://sensirion.com/us/products/catalog/SLF3S-0600F/.
There are many documents on that page and even a link to a library for Arduino on Github. That library uses a fixed I2C Address: static const uint8_t SLF3X_I2C_ADDRESS = 0x08;
Some sensors can change their I2C address, but this sensor does not mention that.
I was already shivering and sweating, because that is often hard to do, but I can relax now, the sensor can not change its I2C address.
A "general call" is mentioned in the I2C standard. It is not often used. This sensor uses the "general call" for a soft-reset. I guess that is allowed, but I don't know if that is a good thing or a bad thing.