I know you said you set alt-text and that is fine, the end result is the same, however, the proper field would have been the "Actual Text" field to say it phonetically as you wish. Not a big deal.
However, if someone wanted to inspect that word using assistive technology letter by letter they would hear your modification and not the actual letters on the page. There are 3rd party tools that allow you to fix those all in one shot document-wide. However, without them, it is a manual process for each instance.
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