There used to be respect for making mayonnaise because the emulsification was done by hand with constant stirring and it often separated. In the meantime, hand blenders have become established in the kitchen - especially those that come with an emulsifying attachment.
If you want to make a noble mayonnaise for homemade burgers or French fries, for example, you are well advised to use a blender.
The variant presented here is a flash mayonnaise, i.e. the variant with a whole egg. Interesting for all those who a) do not need much, b) don't want store-bought mayo and c . . .