>top-15 players from the relevant 2019 ITTF World Tour Standings; and
>one Host Exemption selected by the relevant Host City Partner.
Host Exemption:
• Each Host City Partner will select one (1) male and one (1) female player to participate in the relevant T2DIAMOND 2019 event as Host Exemptions.
• Each Host Exemption must be ranked in the top-50 of the ITTF World Rankings at the time of selection, and must not have qualified to compete in the relevant T2DIAMOND 2019 event from the World Tour Standings.
1) it’s still only top 15 players,
2) Makes no mention that this selected ‘Host Exemption’ needs to be from the Host City(a Malaysian in this case), just that they have the privilege to select one, from the top 50 who hasn’t qualified. Read ‘Host Exemption’ as wild card. Szocs was the 2018 champion from the host city, but didn't qualify, so they picked her.
At least that’s how I read into the document.
(Or as Tempest says ‘Host Exemption selected’ explicitly exempts the selected from being OF the host.)