Definitely not. The way how they work is different from one another. If you'll understand the principle of gambling, it's pure luck based. Thus, there is really no professional here. You can't help yourself from losing in gambling if your luck isn't favorable of you but to stop. Meanwhile in day trading, you might lose continuously but you can be professional there with decent experiences and knowledges of course.
This is the right definition of day trading in its sense. When you are a gambler for 40 years all of your winnings are coming from your own luck, not your skills. Whenever you put your money on the table, you only waiting for the unknown results. Whether you win or lose, it's all about luck. On the other hand, Day trading will give you tremendous experiences in the long run which will become a skill after so many day trading you had through the years.
While what you are saying it is true there is one big problem very few people accumulate as much experience as day traders, and the reason is that most people that try to day trade are newbies that are going to lose all their money in less than a year, and the few successful traders that can make money in the markets that way give up after a few years since it is very stressful to watch the markets every day for years without rest and prefer to become swing traders or position traders.