True, that meaning seems to be typical now. The opposite is the original meaning though.
> Scores of authors use the phrase “steep learning curve” or “sharp learning curve” in reference to a skill that is difficult to master. . . . Nevertheless, from the standpoint of learning theory, these and other authors have it backward, because a steep learning curve, i.e., a curve with a large positive slope, is associated with a skill that is acquired easily and rapidly (Hopper et al., 2007).
> Scores of authors use the phrase “steep learning curve” or “sharp learning curve” in reference to a skill that is difficult to master. . . . Nevertheless, from the standpoint of learning theory, these and other authors have it backward, because a steep learning curve, i.e., a curve with a large positive slope, is associated with a skill that is acquired easily and rapidly (Hopper et al., 2007).
Source: Fifty psychological and psychiatric terms to avoid: a list of inaccurate, misleading, misused, ambiguous, and logically confused words and phrases (https://www.frontiersin.org/journals/psychology/articles/10....)