It's actually better than that. TSMC wouldn't help intel with their 14a node. They would kill it, fire all of Intel's foundry R&D, and just build TSMCs 14a node.
You euphemistically called it "help", but all you agreed to was a hostile takeover of a competitor only to gut said competitor. If a company genuinely thinks they are ahead, they don't have to do these petty tricks unless they want to nib a promising competitor in the bud while they are small and cheap. Intel is neither, nor is it a promising purchase. The only thing of value they possess is x86 IP.