is that true
Yes. It's math....
Confirmed couple of years ago with rep...
OFFER TERMS
Add one or more new Additional Card Members to your account and you can earn 10,000 Membership Rewards points for the first Additional Card Member that spends $2,000 or more in eligible purchases on their Card within their first 6 months of Card Membership starting from the date on which the Additional Card Member is added. The maximum you can earn as part of this offer is 10,000 Membership Rewards points. Purchases made by other Additional Card Members on your Account will not count toward the $2,000 purchase requirement. Purchases made by eligible Additional Card Members will not be combined to satisfy the $2,000 purchase requirement. Your purchases as the Basic Card Member will not count toward the $2,000 purchase requirement.