https://www.databricks.com/notebooks/delta-lake-cdf.html

I am trying to understand the above article. Could someone explain to be the below questions?

a) From SELECT * FROM table_changes('gold_consensus_eps', 2)

why is consensus_eps values of 2.1 and 2.3 for date 3/1/2021? How are those values tabulated?

b) SELECT * FROM gold_consensus_eps

consensus_eps values of is now 2.3 for date 3/1/2021, is it because it gets from _change_type='update_postimage'?