The Book talks about many other messiahs before Jesus like Mithra, Dionisus, Horus, Buddha etc. and asks, where all the attributes came from. The fact that it is all astrological representation, based on ancient stories, and that it correlates with many others is enough to say, yeah, the Bible is based on Astrology.
Confirmation bias could be applied to anything, really. The theory of evolution or the theory of gravity for example.
Interestingly, your article mentions the astrological theory.
Fish in the Gospels
Fish are mentioned and given symbolic meaning several times in the Gospels. Several of Jesus' twelve disciples were fishermen. He commissions them with the words "I will make you fishers of men."
At the feeding of the five thousand, a boy is brought to Jesus with "five small loaves and two fishes". The question is asked, "But what are they, among so many?" Jesus multiplies the loaves and fish to feed the multitude.
In Matthew 13:47-50, Jesus compares God's decision on who will go to heaven or to hell ("the fiery furnace"😉 at the end of this world to fishers sorting out their catch, keeping the good fish and throwing the bad fish away.
In the John 21:11, it is related that the disciples fished all night but caught nothing. Jesus instructed them to cast the nets on the other side of the boat, and they drew in 153 fish. It has been observed that, like many other numbers given in the Bible, this number is associated with a mystic property, in this case the vertical ratio of the shape known as the vesica piscis.[3]
A less commonly cited use of fish in Christ's life may be found in the words of Matthew 17:24-27, in which, upon being asked if his Teacher does not pay the temple (two-drachma) tax, Simon Peter answers, "Yes." Christ tells Peter to go to the water and cast a line. He says that a coin sufficient for the tax will be found in the fish's mouth. Peter does as told and finds the coin.