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why is butter called a colloidal mixture?

Solidified butter is gel and liquid butter an emulsion.

Butter can be referred as both emulsion colloid and gel colloid. This is because it can be dispersed in either fat or liquid. Butter in solid (fat) form is referred to as gel colloid. While in its liquid form it is emulsion colloid.

When dispersed material solid (fat) dispersed in liquid (milk) called Butter as gel

When dispersed material liquid droplets (milk) dispersed in solid (fat) called Butter as emulsion.

Hence Butter is called a colloidal mixture.

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the particles are uniformly spread throughout the solution, but the classification of solution as heterogeneous and homogenous mixture is based on the phase (physical state) of the components involved.

If the dispersed phase and dispersed medium have different physical state, then the mixture is called heterogeneous mixture and if the dispersed phase and dispersed medium have same physical state, then the mixture is called homogenous mixture. *Solid in liquid is the example of heterogeneous mixture. For e.g. colloidal solution, the solid particles are dispersed in liquid.eg: butter.
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