It depends. The Google Keyword Planner is a useful tool for anyone creating a digital marketing campaign, but its predictions shouldn't be taken as gospel.
The reality is that keyword planner cannot predict exact visitor numbers to your website or exact search volume. It only provides an estimation. It also tries to project data based on an average of past data. As a result, reality can often vary greatly from the estimations.
To get a clear idea of exactly how effective a particular keyword will be, you'll need to experiment and test. This can be done by monitoring web traffic and GA analytics to understand what keywords are contributing the most to the performance.
If you’re looking for hyper-specific predictions, Google Keyword Planner probably won’t be the most reliable tool you have at your disposal. However, it can still provide a valuable insight into certain trends, as a starting point and for overall guidance.
Overall, the Google Keyword Planner can be a great resource for helping to decide which keywords to target, but you should also be aware that its predictions may not be as accurate as you expect.