Gibraltar Dec 2023 finance income

The following is an extract from the draft trial balance of Gibraltar Co as at 31 October 20X3:

$

Land – carrying amount at 31 October 20X3

800,000

Buildings – carrying amount at 31 October 20X3

476,000

Investments – fair value through profit or loss (FVTPL)

178,400

Investments – fair value through other comprehensive income (FVTOCI)

120,000

Share capital at 1 November 20X2

900,000

Share premium at 1 November 20X2

500,000

Revaluation surplus (Investments) at 1 November 20X2

32,514

Retained earnings at 1 November 20X2

436,607

Revenue

3,765,505

Cost of sales

2,446,577

Distribution costs

116,166

Administrative expenses

127,713

Other income

15,151

Income tax expense for the year ended 31 October 20X3

428,000

This note is relevant:
(3)
During the year ended 31 October 20X3, one of the FVTPL investments which had a carrying amount of $62,000 was sold for $59,000. The proceeds have been deducted from the year-end balance of these investments, however, any gain or loss on disposal should have been recorded in administrative expenses. The remaining investments in this classification had a fair value of $184,300 at 31 October 20X3 which still needs to be recognised. Any gain or loss on revaluation should be recorded in other income.

But the answer says:
“We must then perform a valuation on the remaining investments classified as
FVTPL. The fair value gain at 31 October 20X3 is $8,900 ($184,300 – [$178,400
– $3,000]):
Dr Investments – FVTPL 8,900
Cr Finance/Investment income 8,900
being year-end valuation on remaining financial instruments classified as FVTPL”

By the way, the answer also moved the other income’s OB of 15,151 to Finanance/Investment income account to finalize the Finance/Investment income item on PL at 21,051.

so, why was the note stated that “Any gain or loss on revaluation should be recorded in other income”.