Can he not do that on the flat pattas in the World Cup?
I doubt for 2 reasons - first one is age, he is into his 40s and at this age by every day reflex & hand-eye declines. WC is still 8 months away and don't get fooled by his century on this Dubai track. 3 years back, he scored a MUCH better 150 against a far better attack in UAE, then we have seen him in ENG.
Second one is a misconception of flat English wicket. What you had seen between ENG-PAK & ENG-IND ODI series doesn't reflect the true picture because both Series were played in later part of summer; WC will end by mid July. In June-July ball will swing in UK even on flattest of wickets. Bounce or pace was never MoHa's biggest problem, won't be much even at this age, but he is almost like tail-ender against anything that moves slightly, off the surface or in air. Most of his serial killers are movers of the ball, rather than blasters. He'll struggle in WC, you can take any bet on that, but if his bowling is effective, may be, just may be he can be taken in squad as 2nd spinner to bat at 6. I don't think with a legal action he is better than Mahmudullah or Mosaddek, hence I'll not pick him - PAK might think otherwise.
PAK is an unique cricket nation which digs own hole from tactical blunders, and then jumps into it. You can recall my post just before Asia Cup - "if Sarfraz's team fails to win Asia Cup, MoHa'll come back against AUS squad, if they fail to make the Final, he'll open against AUS .... and if they fail to make Super 4 - he might lead against AUS (I kept this part in dots, from the fear of Pankha base, BD didn't knocked PAK out of Asia Cup yet when I wrote that post).
MoHa is extremely lucky to get the chance of bashing this AUS side because Ul Haq, his Dronachraya & his Arjun picked a horrible squad in Asia Cup with 6 pacers and absolute no specialist spinners - after playing there as home for 10 years now. Even with 2 regular spinners PAK won't have made the cut simply because of the show by their batsmen, but it won't have been such a bankrupt show, despite Sarfraz's novice Captaincy. MoHa is called back from a panic mood rather than anything else, otherwise he won't have carried drinks against ZIM reserves and won't have missed the SRL Test series last year.
Now, that one blunder (of Asia Cup), could have resulted positively for a more intelligent cricket team - that's sacking & dropping of Sarfraz, and couple of genuine spinners picked for AUS Series, may be 1-2 new batting faces as well - WC is 8 months away, with a full domestic season & one PSL to go - more than enough time to almost rebuild a fresh squad. For PAK & PCB, it obviously has gone from boiling water to frying pan - Sarfraz retained (he'll be sacked, or "rested" after SAF tour, almost certainly), MoHa, Wahab called back, they are playing 4 spinners, 3 of them "all-rounders", and I won't be surprised if PAK ends up giving overs to Asad & Azhar as well - that makes 5 spin "all-rounder", who can bowl & contribute with bat.