Does the valuation take into account the preference shares?
It does not. Their value will depend on whether Abil is likely to issue pref share dividends in the future. Will know when strategy is released. If not then they could trade at a significant discount. Accounting for full pref share valuation above (which is unlikely) would then see a 4bn - 1.1bn = 2.9bn Market cap for Ord shares at PE 10 or R2 share.
With 2bn in cash a low risk interest bearing account would already see annual profits of around 100-200m per annum. Add the Stangen profits and at low PE of 6-7 those likely dumping their shares under R1.50 on Wednesday could live to regret.