Yeah, that advice is solid. I'd add that on Switch you're basically stuck with vanilla, so you don't have mods that rebalance the skill curve (stuff like Ordinator on PC changes how pickpocketing scales, makes it way less tedious), which means you're grinding the "intended" experience and it genuinely sucks early on.
The radiant jobs thing is the real move though. You're getting paid and leveling, so even when you fail a pickpocket check during a job, you're not just eating the loss—you're already compensated. Plus the Thieves Guild questline itself has some actual story moments, so it doesn't feel like pure grind. Way better than standing in Whiterun stealing iron daggers for two hours.
Fwiw if you really hate it, pickpocketing is one of the few skills where you can just... not engage. Unlike, say, Destruction magic where you kinda need it to be a mage, or Smithing where it's almost mandatory for endgame gear, pickpocketing is pure flavor. You can steal stuff the boring way (kill everyone, loot bodies) or just buy what you need. Not optimal, but it works.