Your point would have merit if 'grass, herb and tree' meant plant. But ...
But wait a minute, says Parker. If you take 'grass, herb and tree' to mean photosynthesising life in general, then this is, once again, spot on.
The very life forms on earth were single-celled bacteria, but the first truly viable bacteria were the 'cyanobacteria' - those that had learned to photosynthesise.
It makes perfect sense. The grass, herbs and trees that are brought forth by the earth (aka 'dry land') on the third day just have the sun, the moon and the stars being placed in the firmament of the skies on the forth day.
OK, not really. This forcefitting of Genesis 1 to modern science is like applying a wrecking ball to a Gothic Cathedral; and to excitedly ask afterwards, while pointing triumphantly at the rubble, "Just
HOW could those medieval peasants have built these fantastic, several hundred story high skyscrapers?"