The phrase "he restricts" is grammatically correct and can be used in written English.
Example: In order to maintain a healthy weight, John restricts his daily calorie intake to 2000 calories.
Luckily, he restricts himself to Tanya.
These days he restricts himself to a nightly spliff.
To keep things moving, he restricts each presenter to a couple of minutes.
Instead, he restricts himself to underscoring the ever-present dangers of the abuse of power.
But he restricts his visits to work-related socializing, paid for by his employer.
Yet when he restricts himself to a simple idea, he is dynamic.
Very early in his work he restricted himself to the colors black and white, a restriction that would last almost 40 years.
Was he restricted by his involvement in two cult classics?
Nor does he restrict his barbs to those below him.
Why should he restrict himself to a bus queue, when he could take Tel Aviv with him?
He restricted himself to reading from the liturgy and delivering his homily.
