No, it just means that during the period after you stop working at the old job but before you can start working at the new job, you are paid only your base. This can be a significant reduction in total comp in industries such as finance.
I have worked jobs where the best bonus over 5 years was $500, while the typical year all we got was a promise that if things go well there will be a bonus. I've worked other jobs where the worst bonus was $15000 (a really bad year for the company), and could be up to $50,000. This is as a regular engineer, management can get a lot more. The first company taught me at until the money is in my account the bonus is meaningless. The second taught me that they aren't just a rumor. Most companies don't even pretend to offer a bonus which is acceptable - at least I know what I will make.
I think everyone should make 2-3x the poverty level income (we can debate exact numbers), and everything after that is bonus. So long as the company pays a bonus most years it means in a bad year you have enough to live on and don't need to find a new job, while in a good year you have a nice bonus to buy nice toys.
In finance, it's common to see a base of 150,000 and a VR of between 300k and 750k for engineers. During garden leave, you get paid your $150,000 as part of payroll, but are ineligble for VR. Your total comp goes from 450,000 (in mediocre years) or 900,000 (in good years) to 150,000 for whatever your non-compete period is (6 months, 12 months, 24 months are all common).
In finance you make more money, but work more hours and have more stress per hour typically. Still probably a good deal, but it's not a Pareto efficient deal.
