Laning Vs Nasus is a paradox
You either poke him super hard and hope you can delay his late game long enough for your team to do something as he farms under his tower but suffer constant threat of deaths because of a wither + ganks +ult which mean you're almost guaranteed dead early game.
Or
Allow him to farm and ”build tank!” whilst your team mates fail to get a lead, ignore top in the hope he goes away then are shocked when he gets 3rd tower and proceeds to kill 3 team mates at once under your inhibitor after free farming 20 minutes.
That's about the depth of a modern Nasus game. It's sad LOL has come down to which teams have the most broken champs now. The current game design is horrible.