The last line of the title is misleading, as chemo is already possible and is commonly used to treat glios.

The article indicates the primary benefit is that the treatment negates the need for surgery and radiation, and may increase the efficacy of chemo. This may be especially beneficial to patients who present with non operable tumors.

This is certainly progress, as the recovery from surgery and then the side effects of radiation are both brutal. However I would guess that for patients with operable tumors this won't increase survival rates.

I was told by a leading glio specialist at a top hospital that back in the day they tried removing entire lobes of the brain to remove a glioblastoma, and it would eventually just come back somewhere else in the brain anyway.

All the current treatment is just to try and extend the incredibly short life expectancy.

Source: My mom was diagnosed with a glioblastoma a few months ago