Meanwhile in Germany:
Krieger wider Willen - Warrior against his [Olaf Scholz - Germany’s chancellor] will
Putins blutige Spur - Putin’s bloody path
Gefährlich schwach - dangerously weak
Putin ist ein Drache, der fressen muss - Putin is a dragon that needs to feed
Wie schwach ist Putin? - How weak is Putin?
Not OP, but it looks like they are using texlab for completion: https://github.com/neovim/nvim-lspconfig/blob/master/doc/server_configurations.md#texlab
Apart from that there is https://github.com/lervag/vimtex with file type support, document compilation, etc. For grammar checking I use https://github.com/neovim/nvim-lspconfig/blob/master/doc/server_configurations.md#ltex and for snippets https://github.com/L3MON4D3/LuaSnip. See https://github.com/iurimateus/luasnip-latex-snippets.nvim for latex snippets and what you can do with them.