Good advice
Many people will overfeed pellets and obesity is a serious problem with rabbits. It can lead to health issues, plus can make any health issue worse. Don't go by the quantities given on the side of the pellet bags. The manufacturers want you to buy more
I feed my two an eggcupful each per day, spread over four different times and hand-feed them. I hand-feed to ensure that one bunny doesn't have more. Pellets are also a very useful health check. I know that if they refuse pellets, they are unwell.
Yes, see which pellets they are being fed, when you get them. Then I would gradually change or reduce the quantity, according to what you want to feed long term, but do it very gradually.