That is a carefully rehearsed answer making the weakness look fixable instead of being serious weakness.
> sincerely and honestly state a reasonable weakness.
No, the question was "what's your biggest weakness", the "I haven't practiced doing this kind of work" is not a big weakness, everyone have bigger weaknesses than that due to their personality.
An honest answer would be "I am much slower learning technical things than my peers" or "I am competitive so I often come in conflict with my peers" or "I am afraid of conflict so I have a hard time making decisions" or "I get bored easily so I have a hard time finishing things" or "I constantly wear a mask so people never learn to know the real me" or "I don't like being proven wrong" or "I judge peoples competence by how much I like them rather than what they actually do" etc.
There is not a single person who doesn't have one weakness like that since many of them are a spectrum where no position is good. The "correct" answer is of course like you said, you give an easily fixable weakness like "I don't fully understand how deployment pipelines work since someone else did most of the work where I worked previously". But such answers are so easy to come up with, and are guaranteed not to be their biggest weakness, so you are basically checking whether they are fine with lying or lack self awareness.