The info is on the same page, it states you don't claim, they get dispatched once outside the cooling off period:
Galaxy Buds2 Pro
Buy the new Galaxy S23 Ultra and get a pair of Samsung Galaxy Buds2 Pro earphones worth £219. Offer runs until close of business 16 March 2023. Terms apply – see features tab for full information.
The features tab states:
Get a pair of Galaxy Buds2 Pro worth £219
Get free Samsung Galaxy Buds2 Pro Graphite when purchasing any Samsung Galaxy S23, Samsung Galaxy S23+ and Samsung Galaxy S23 Ultra. Offer starts 17th February 2023 and runs until close of business 16th March 2023.
Your Samsung Galaxy Buds2 Pro Graphite will be delivered to your account address within 15-30 days of your purchase, excluding weekends.