Select sauté, heat oil and brown the seasoned roast pieces on all broad sides in batches; transfer to a plate.
Cook onion briefly, add garlic and tomato paste, then pour in broth and scrape every browned bit from the bottom. Cancel sauté.
Add Worcestershire, thyme and beef. Lock the lid and cook at high pressure for 60 minutes, then allow a 15-minute natural release.
Release remaining pressure safely. If a fork does not twist easily, cook 10 minutes more at high pressure with another natural release.
Transfer tender beef to rest. Add potatoes and carrots, lock the lid and cook at high pressure 4 minutes, then carefully quick-release as the manual directs.
Remove vegetables, stir slurry into liquid and simmer on sauté until lightly thickened. Slice beef across the grain and serve with gravy.