But yes, he wants more than he would have had if he’d stayed. Before QE2 died iirc, his security came as part of being the family of the PoW. Nowadays he’d be just another working royal, like Anne and the Edinburghs, and they do get a lower level of protection than KC3 and the Waleses. Harry is so stupid that he thought he was / would be an IPP and have free security wherever he went. Dimwit.
Also - if he'd stayed then a lot of his security would have come from living in a secure area with other royals at Windsor/Kensington Palace. But Harry has repeatedly refused offers of secure accommodation at Buckingham Palace and St James' Palace.
So he expects UK taxpayers to foot the bill for round the clock security at Soho House or whichever hotel he chooses to stay at when there are empty, secure residences.
Harry loves the presidential style security that he pays for in the US - 4 car convoys of blacked out SUV's. Remember when Meghan organised a convoy to transport her a few blocks from a restaurant to a theatre? This type of security is hugely expensive as about 8 bodyguards are required (4 to drive + several to open doors and escort her inside).
Yet most royals don't get anything like this level of security. Princess Anne and Prince Edward & Sophie only get security when carrying out official engagements - not for private events. Even on official duties - I don't think Anne has ever arrived in a 4 car convoy ... she arrived at her own wedding in a Land Rover!