The LLC won't protect the company you're working with from AB5. You would need to form an S-Corp and put yourself on payroll with benefits, or work through a staffing agency on W2, or become the company's employee, or move out of CA. In other words, your only options are to become an employee of a company or leave CA.

Of course, its probably not in your best interest to mention this to the company you want to work with since they'll probably just choose to work with someone outside of CA instead. Just be glad their legal counsel (if they have any) doesn't know enough about this law to cause you more headaches.