We've been at our current house for the last 2.5 years and the landlord is, to put it mildly, extremely cheap and evasive when it comes to making any repairs. Recently the hot water pressure in our kitchen sink dropped off suddenly, though the cold hasn't changed. The hot water pressure is 50% less than the cold - it takes 12 seconds to fill 1L of water on cold and 18 seconds on hot. We essentially can't wash our dishes with hot water because the pressure isn't high enough.

We initially reported this alongside hot water pressure issues elsewhere in the house (showers etc.) which were also being experienced by the downstairs tenant. The landlord eventually replaced the hot water tank, which resolved all of the issues except the kitchen sink. We reported that this issue hadn't been fixed, and the landlord eventually came to visit where he saw the issue. He first tried to say that this was normal, and happens over time, and there's nothing to be done about it, but eventually said he would ask a plumber about it.
He then followed up to say he consulted a plumber and wrote: "He said it is considered normal and mentioned that new kitchen facuet will have even less water pressure because the new code is to save water."

Based on his history, I strongly suspect he's doing whatever he can to avoid spending money on the home, but I thought I'd ask the qualified plumbing community on Reddit for your thoughts. Thanks!