YES, "glittering generalities" is correct.
Step-by-step explanation:
As defined by Richard Nordquist, writing for ThoughtCo, "A glittering generality is a vague word or phrase used to evoke positive feelings rather than to convey information."
In the political candidate's promise, "I will promote growth that will bring us into the 21st century," the candidate uses vague, hopeful-sounding terms -- but doesn't specify how exactly the candidate will work to achieve those goals. Offering glittering generalities is not wrong, but if there are no concrete action plans or details provided, then the phrases are only propaganda.