Not just Bosch ECUs, not just European car companies, and this shit has been going on for decades.
All the car companies do it and have since at least the 90's. The proof is in the ROM dumps of all the various cars - the tuners can point to two sets of tables of fuel mixture/timing maps, one for when the ECU thinks it's being emissions tested and one for regular use.
As early as the late 90's tuners offered features where doing something with the cruise control buttonss which would switch the engine computer back to stock programming to pass emissions, run on cheaper gas, or fool the dealer if it went in for service. How does everyone think they were able to do stuff like that without any hardware mods?
Oh, and all the car companies were self-reporting their CO2 emissions in the EU for decades. When EU regulators actually got around to testing cars, shockigly, the companies were lying.
It's basically accepted at this point that Telsa lies about their range and efficiency numbers, and recently there's evidence they have been fucking with people's odometers for the purpose of getting them out of warranty quicker.
Ferrari have all sorts of terms and prohibitions on things journalists can't do with their cars - one being track lap time testing. Why? Because they got caught by Top Gear specially modifying their cars for the Top Gear test circuit, as well as using tires that aren't on the production vehicles - and when Top Gear called them out, Ferrari permanently banned them *and have gone so far as to prohibit Ferrari owners from allowing Top Gear staff access to the owner's vehicles for testing, under threat of being blacklisted. Now that they've been caught cheating, they simply won't allow anyone to test their cars versus anyone else's.
The wheel keeps on turning.