What the hell this is a ridiculous claim.
2024 Transfers -> Linked to Jonathan Tah, the best defender of the team who beat Bayern in the league. Bought Ito, the best defender of the team that finished 2nd place.
2023 Transfers -> Bought Leipzig's (3rd) 2nd best midfielder on a free, took Dortmund (2nd, by the bearest of margins)'s best fullback on a free.
2022 Transfers -> Nothing of note
2021 Transfers -> Took their closest rival Leipzigs best defender, best midfielder and their manager in the same window
2020 Transfers -> Nothing of note
2019 Transfers -> Best midfielder in Bundesliga that year on a free transfer.
2018 Transfers -> Sule, Rudy and Wagner from 4th place Hoffenheim
2017 Transfers -> Dortmunds best defender
2016 Transfers -> Kimmich (though not really Bayerns rivals that year), and Ulreich too.
2015 Transfers -> Dortmunds best striker and best striker in the division
2014 Transfers -> Dortmunds best midfielder
2013 Transfers -> wolfsburgs best striker and Gladbachs best defender
2012 Transfers -> Neuer, who had gotten his club to the CL Semi Final
I can't be bothered to go deeper, but in the past 12 years, you've signed 18 of the league Top 4's best players. 18
This is the equivalent of City buying from Liverpool, Arsenal and Man Utd every season.