In this server we can see tickrate 128 and server not force people to use 128 tickrate.
196608 have people with 128 tickrate set it manual by player, 80000 people like me who not set in console.

This server 128 tickrate and they not force me to use 128 tickrate.

I'm play at laptop and not make any changes in console.|
And again look at this picture, this is 128 tickrate and they force me to play at 128 tickrate.

Yes i'm play some time, in your screenshot tick rate server 64.

Server name 128 tick, server tick 64.

Disable 3dp view for death
mp_spectator_allow_chase 0

I insist that an unconfigured client can be forced to use 128tickrate. For an example, go to this server with a non-configured tickrate parameter and check the net_graph 4 command. 194.61.1.200:27035 [RU]~~Basement of NIKOLAY~~ https://cache.gametracker.com/server_info/194.61.1.200:27035/b_560_95_1....

If you enter this into insurgency.cfg (server parameters), the client will be forced to work at 128 tick rates.
sv_minupdaterate 128
sv_mincmdrate 64
sv_maxcmdrate 128
sv_minrate 128000

Is it possible to switch Insurgency server from 64 tickrate to 128 tick rate with this settings in insurgency.cfg
sv_minupdaterate 128
sv_mincmdrate 64
sv_maxcmdrate 128
sv_minrate 128000