The issue the court had was that if you write it down then there is the possibility that you worked overtime but didn't actually write that or your employer changed it. If start and end of work time are accurately tracked then you can sue them for not paying you overtime.
No, this ruling cannot prevent this practice at all. How could it, without a government official standing watch?
Alternatively employees can raise the matter in court where the additional incentive of money paid to settle the claim makes it worthy of a lawyer handling the matter purely based on expectation of obtaining a cut of the money.
Plus, accurate records are a good basis for any lawsuit in case an employee claims they worked unpaid overtime.
You explicitly stated you'd get tracked for 2 hours for 5 minutes of work.
This differential - which you must have brought up for a reason - is specifically not what the law is trying to address.
What's off the table with this ruling is that a timesheet does not exist, because "we're all friends here, we trust our employees (to work themselves to exhaustion out of fear)"
(FYI, I'm still tracking the exact time, but the time I have to work gets reduced from 38 to 36 hours)
The law doesn't want to know how much you bill or how much is allocated, but how much you actually work.
I the context of labour, surely it makes sense, but there, most hours are logged.
Outside of that it gets a little harder.