What I meant by "not top of the line" was it wasn't a big budget Hollywood movie, and I though some of the effects look like what you'd expect from the 1990's instead of the 2020's. Which is funny because the article you linked also compares the effects to 1990's vfx.
So if you want to get nitpicky there are some shots of Godzilla here and there that look inferior compared to the recent Hollywood CGI versions, but it's very well shot within the restraints of the budget, and they got a lot of bang for their buck. They did the whole movie for less than $11 million, while the recent Hollywood Godzilla movies all cost in the $150-200 million range, and I'd watch this one again before any of those.