No. World-class card counters move around. If they win a bunch of hands after spreading more money, they get up and leave, not to return for weeks or months.
You cannot intentionally lose hands to throw the casino off the scent, because the edge in blackjack for a counter is too small. You are playing with maybe a .5% to 1% advantage at most. Make one mistake every 50 to 100 hands, and all your profit is wiped out. And if you make lots of mistakes while betting very small, then play like a champ when the bets are big, that in itself is a tell. As you say, the casinos know the tricks.
In the modern era, there are exactly two ways to remain a card counter: One is to bet small enough that the casino doesn’t care. Spread your bets $5-$50, and you can probably card count to your heart’s content and no one will bother you. The casinos take an interest when the bets go above $100, generally.
The other way is to never be in a casino long enough for the casino to track your play. If you are getting bad shoes with low counts, you’ll bet the minimum and play like anyone else. But once you get that high true count, you want to have at least eight to ten times as much money in play. As soon as you raise your bets, you become suspicious. So at the end of that shoe, win or lose, you pack up and leave and go to another casino.
The real professional counters will show up in Vegas, play for a few days at different casinos, then leave and go to another location, They may come back to Vegas in six months or a year or more. They will also keep copious notes about the behaviour of the security in the casinos, whether they took an interest in you or not, etc. Casinos that maybe paid a little too much attention last time you showed up get skipped. They also take notes on what they wore, what their hair style was, whether they were wearing glasses, etc. Then take pains to dress very differently next time
The true great card counters are ghosts. They can’t afford to be made as counters, because the casinos all use the Griffin detective agency, which means if you get busted in one casino for card counting, you may get banned from all of them.
The really high limit counters are rare. Maybe only a half dozen or so. Because when you start betting $5,000/hand, you have to act like a rich person or ‘whale’ or you’ll be i,ediately scrutinized. The holy grail for the best card counters is to take a casino for a lot of money while also being comped the executive suite, all meals, and even a private jet to pick you up and take you home. I knew of one guy who did that and got away with it for a long, long time. Maybe he still is.
Campuflage and staying under thr radar is by far the hardest part of card counting for serious money. In the modern era, the casinos can simply record every hand from the ‘eye’, and if someone exhibits a pattern that matches a card counter, automatically alert security. There’s no escaping that. You could play like an idiot for hours, but the first time you spread your bets and change your play a computer could flag your play as suspicious. Hence the need to get up and leave before they gather enough data to positively make you as a counter.