The fact this report is coming from a commercial enterprise and not a university is pretty encouraging. Obviously it could still just be PR, but they likely wouldn't be touting this unless they expected to bring it to mass production.
Yes. But not the converse.
“Kevin Shang, senior research analyst at Wood Mackenzie, a data and analytics firm, said that “unfavorable mechanical properties,” as well as the difficulty and cost of mass production, are challenges for moving the application of solid-state oxide-based batteries into smartphones.”
“The group plans to start shipping samples of its new battery prototype to clients from next year and hopes to be able to move into mass production after that.”
So they don’t know yet if they’ll be able to pull off mass production, and it’ll be at least a couple years off.