"but only recently did Jehovah start the creation process on the Earth,"
Not so. That each creative day was millions of years old, is said in talks and taught. A common phrase would be something like that science tells us the Earth is billions of years old, plants many many millions if years old etc. - and that does not contradict the Bible.
Official WT statement on length of creative days: (notice they say 'thousands', not 'millions')
https://www.jw.org/en/publications/magazines/g201401/creation/
God created the universe, including the earth, in the indefinite past—“in the beginning,” as Genesis 1:1 says. Modern science agrees that the universe had a beginning. A recent scientific model suggests it to be almost 14 billion years old.
The Bible also describes six “days” of creation. However, it does not say that these were 24-hour days. (Genesis 1:31) In fact, the Bible uses the word “day” to refer to various lengths of time. For example, it calls the entire period of creation “the day that Jehovah God made earth and heaven.” (Genesis 2:4) Evidently, these “days” of creation lasted many thousands of years.—Psalm 90:4.
Granted, the WTS often says things in person at assemblies, KHs, etc that lead people one way, while the official doctrine goes the other, and this is one of those times. They so want to not be creationists, they have to twist the logic and doctrine so much, that they end up contradicting themselves, and the Bible
Official WT statement on universe and earth existing before creation process as described in Genesis:
https://www.jw.org/en/jehovahs-witnesses/faq/creationism-belief/#?insight[search_id]=06097ccc-99f4-4323-bfd5-221cc7cabbd6&insight[search_result_index]=1
Age of the earth. Some creationists teach that the earth is just a few thousand years old. However, according to the Bible, the earth and the universe existed before the six days of creation. (Genesis 1:1) For that reason, Jehovah’s Witnesses have no objection to credible scientific research that indicates the earth may be billions of years old.
And while that sounds more reasonable than your average run of the mill creationist, it doesn't agree with the Bible, you know, that book that is the end all be all to WT doctrine..
Exodus 20:11
For in six days the Lord made the heavens and the earth, the sea, and all that is in them, but he rested on the seventh day. Therefore the Lord blessed the Sabbath day and made it holy.