At this time, half a year, he means that it will be half a year before he can apply for an increase in the number of places. Doesn't mean you can definitely approve the gold card. Of course, there is still a chance to approve gold cards.
There are many possibilities.
For example, you use it for three years. Maybe the limit of your card is still the same. And if you don't use your credit card well and have a bad record, it may be ten or eight years.
Maybe, in less than half a year, you will have a car and a house, or you can submit the information immediately. Approve the gold card immediately. If it still can't be approved, then sell it and apply again.
Of course, the first few people are right. Credit cards are more expensive. Repay on time. Minimize cash withdrawals and so on. This is a good way to increase the quota.