Why going past Allan Donald is secondary for Kagiso Rabada?

Kagiso Rabada accounted for five wickets on day 1 of WTC Final 2025 against South Africa. On his way he took over Allan Donald as the fourth-highest wicket-taker in tests for South Africa. However, the 30-year-old brushed aside the achievement as secondary saying, "That's all secondary. The primary is to keep running and doing the job."