Squirrels are intelligent and persistent. The only reliable solution is population reduction via trapping.
For tomatoes, trap the specific culprits. An aggressive pet helps too.

UK Grey Squirrels Ignore Ultrasonic Repellent: Fence or Repellent Spray
Keeping Voles, Squirrels, and Deer Out of Your Vegetable Garden
Managing Squirrel Damage in Lawns and Gardens
Squirrel Deterrence for Carnivorous Plants and Slow-Waking Purple Pitcher Plants
Squirrel-Friendly Gardens: Coexisting with Backyard Squirrels
Squirrel Control: Identify, Deter, and Protect Your Garden
Where Do Squirrel Droppings Go? (And Other Squirrel Mysteries)
Troubleshooting Wilting Tomato, Cucumber, Squash Seedlings
Mushrooms in Raised Beds? Harmless. Cantaloupe Taking Over? Redirect Vines.
Organic Squirrel Deterrents for the Vegetable Garden
Scorpion Management on Rural Property
Flying Squirrel in Bluebird House: Nocturnal Neighbor
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