I agree with Paul that this design is very much not Art Deco. Art Deco is defined as a design style of the 1920s and 1930s characterized especially by bold outlines, geometric and zigzag forms. It is soaring and streamlined, often with multiple parallel lines, sometimes with fan shaped or occasionally with intersecting lines.
Most dealers and sellers of old things do not know the difference between art deco, arts and crafts, mid-century modern, and whatever. What they do know is if they use terms like these - whether or not they apply in any way or not and they usually do not - then they can get a higher price.
If you look on pinterest and enter art deco you will see many examples of what is art deco - though of course since it is not a moderated site there will be 10 percent to 20 percent that is not art deco, but most of will be. The more you look at examples that more you will be able to judge for yourself what is and what is not art deco. You will soon begin to tell which of the photos there are not of art deco objects - though most of them are. Then you will be able to judge glass objects as to whether they are art deco or if you have another all too common dealer who is throwing the word around to get a better price for something that is not, or to be kind who is simply not knowledgeable.