Yes, but it's legal with Congressional approval. Has he been proposing it, and Congress have rejected?

Yes. The article itself is about lobbying against a law the President is proposing (and pushing through commissioned studies, hired experts, &c)

See eg this polemic from House Republicans blaming him for it: https://waysandmeans.house.gov/report-on-direct-e-file-progr...

And here's some straight reporting on the executive branch trying to implement it in roundabout ways, plus efforts on this bill: https://www.cnn.com/2023/05/16/politics/irs-free-tax-filing-...