The phrase "are technically employed" is correct and usable in written English.
You can use it when discussing someone's employment status, particularly in a context where the nature of their employment may be nuanced or not straightforward.
Example: "Although they work part-time, they are technically employed by the company and receive benefits."
Alternatives: "are officially employed" or "are employed in a technical capacity."
The union has been moving to unionise more fast-food workers, but at the moment the process can only be conducted piecemeal, because workers are technically employed by individual franchise-holders, not the bigger chains.
The overhaul has included the introduction of a system whereby City's non-playing staff are technically employed – and paid – by a different company to the playing staff, a legal device that is common in football.
They're deceptive because scientists toiling in endless postdocs or who find work harvesting pumpkins (which happened to my editor's former graduate school colleague for a time, after he earned his Ph.D. in physics studying the thermodynamics of black holes) are technically "employed".
Although the workers may be technically employed by franchisees, their cheap labor benefits the brands that adorn their uniforms and the fast-food executives who run them.
That's because the workers in question were technically employed by a labor supply firm, Integrity, which staffs Amazon warehouses with a seemingly endless procession of temps.
As the Bradenton Herald reported in 2003, the "anti-slavery" bill would have declared that growers were responsible for the payment of migrant workers, even if the workers were technically employed by middlemen.
He's currently serving a 30-day suspension and is incarcerated but is still technically employed at Rikers according to Howard and Seabrook.
And thousands of drivers, who are not technically employed by Uber, may not be able to get back in the country for 90 days.
A lot of sedan and taxi drivers aren't technically employed by the companies they work for.
After being cleared of misconduct charges, Mitchell felt he had "unfinished business" at Golden Lions and reportedly resumed work this week as he was technically still employed by the South African side while working for Sale.
I am technically still employed there".
