Yes Garmin do appear to be reducing their map update frequency, here is a list of map releases for USA and Europe, note that the guys who produced this list used to calculate the number of days between releases, but have now stopped doing this for Europe :-
http://www.poi-factory.com/node/42417
I have added the last Europe NTU day intervals in red :-
2019.10 NTU - Jun 06, 2018 (Wed) => 175
2019.20 NTU - Aug 29, 2018 (Tue) => 89
2019.30 NTU - Jan 03, 2019 (Thu) => 127
2020.10 NTU - Jun 13, 2019 (Wed) => 161
2020.20 NTU - Sep 11, 2019 (Wed) => 90
2020.30 NTU - Jan 16, 2020 (Thu) => 97
actual = 127
2021.30 NTU - May 03, 2021 (Mon)
= 473
2022.20 NTU - Nov 11, 2021 (Thurs)
= 192
2023.10 NTU - May 19, 2022 (Thurs)
= 189
2024.10 NTU - Apr 20, 2023 (Thurs)
= 336