That link to sky doesn't work. This one to the BBC does - Vince Cable vows 'decent' state pension for all

It might be a "vow" by Vince Cable. But he and his party colleagues have already demonstrated that "vows" by Lib Dems are not worth very much. And "not worth very much" overestimates their value.

At most it can be seen as "an aspiration". A "long-term plan".