Is Blazor low code?

No, Blazor is not a low code tool.
Blazor is a full-fledged Web Framework. It belongs to the Asp.Net Core Framework (Which is a framework for building web app and web apis using C# and .Net)

Blazor can be used to build complete SPA (Single Page Apps), Mobile Apps, PWA (Progressive Web Apps), as well as fully featured multi-page apps.

Blazor has multiple flavors which sometimes gets called as Hosting Models and Render Modes. 

Below are the Flavors of Blazor

1. Static Server Side Rendering (SSR) - We can build non-interactive server side rendered static apps using this mode. (You could compare it with Asp.Net Core MVC)
2. Blazor Server (uses SignalR) - We can build interactive server rendered apps using this mode
3. Blazor WASM (Blazor WebAssembly) - We can build fully functional pure SPA (Single Page Apps) and PWAs (Progressive Web Apps) using this mode
4. Blazor Hybrid - .Net MAUI Blazor Hybrid - We can build Cross Platform Mobile (Android and iOS) and Desktop (Wndows and macOS) Apps using this mode

Here are some of the examples of the apps built using these flavors

These videos are in-depth detailed tutorials/courses