Notional Goodwill when impairment occurs

Hello https://opentuition.com/topic/notional-goodwill-in-impairment-loss-calculations/ I found the following answer for that question: "Full goodwill – share loss between NCI and RE – because goodwill is on the WHOLE BUSINESS. Prop goodwill – no loss allocated to NC!" that’s OK and understood. But at the following example it is prop goodwill at acquisition and the loss allocated to NCI, and no notional goodwill calculated, is there an explanation please? Thanks W7 Impairment of Beta as at 30 September 20X2 $000 Net assets of Beta 450,240 Goodwill on acquisition 88,920 –––––––– 539,160 Recoverable amount of Beta as a CGU 500,000 –––––––– Impairment 39,160 –––––––– Non-controlling interest in Beta $000 At acquisition (W2) 98,000 NCI share of movement (25% x $61,160 (W1)) 15,290 Impairment (25% x $39,160 (W7)) (9,790 ) –––––––– 103,500 Impairment for Parent Retained earnings (75% x $39,160) (W7) (29,370 )