it’s difficult and time consuming, but you can claim the Bonus Status Credits. Just make sure you keep screen shots and proof of the offer, registration, date of booking and boarding passes.Just be careful that you are not using a travel credit which has its own booking reference, the way a gift voucher does.
Eligibility for the extra status credit offers works based on the date the booking reference was created.
This sometimes has its advantages but in this case, it is a reason for caution.
If you use a pre-existing booking reference, that may persist for your flight booking, in which case you will not receive the extra status credits automatically.
I do not know if you would have any success in claiming them manually.