This is typical. As a techie, you're triggered by technical detail because you understand the technical details of that example that is intended to illustrate the size of the data collected.
Rest assured that this happens all the time and when people read news about a topic that they are an expert on, they cringe all the time. For example, a paraglider pilot will get triggered if the reporter uses the word "Jumped" in a story about a paraglider pilot who crash-landed and injured two more people. This is because paragliders don't jump but take off from hills etc.
Usually reporting on technical topics is very hard because you need to reach the non-technical audience so you will HAVE TO use illustrative examples and not exactly accurate descriptions so that can be absorbed by the non-technical readers. Unfortunately, this will put you in a position where can be called on by technical readers who are triggered by the "implementation details" of your story.
I do believe that calling out the 5GB illustrative example is missing the point of the article. It's just a way to portray size of the data collected on you, it doesn't have any meaning even if this data was 3Mb or 100Gb. For example, if it was 3Mb Google might have used it to convey how little data they collect on you as if the size that this data takes has any correlation about the impact, then why even bother with such an irrelevant point of the "article implementation"?