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As I understand it there was a new TCP/IP stack added to the linux kernel back somewhere around 2015/2016 that couldn't be backported to the RHEL7 3.10 kernel without breaking the kernel ABI that red hat tries to only change with major versions.

So new to rhel TCP/IP stack not to linux as a whole.

BBR is just an algorithm that tries to figure out the best sending rate of TCP packets. So you don't have to wait for every ACK after a PSH. it was added the the linux kernel a couple of years ago, good to see it in RHEL.

https://en.wikipedia.org/wiki/TCP_congestion_control#TCP_BBR