Well for one people can not read your mind, so arguments help.
The point remains that despite the late written attestation of Albanian which makes labeling the periods akin to Italian <- Latin <- IE impractical, we do have very strong evidence that the stem from which modern Albanian branches off of, was among the first to do so.
Now, whether we will ever have enough evidence to label the different sections of the stem is another issue. Hence the proto label for Albanian here is appropriate.
The etymology of "proto":
proto-
- a combining form meaning “first,” “foremost,” “earliest form of,” used in the formation of compound words (protomartyr; protolithic; protoplasm), specialized in chemical terminology to denote the first of a series of compounds, or the one containing the minimum amount of an element.
Do you see how it is used in its proper meaning?
Abstract The last twenty or so years have witnessed a dramatic increase in the use of computational methods for inferring linguistic phylogenies. Although the results of this research have been controversial, the methods themselves are an undeniable boon for historical and Indo-European...
brill.com
PS: I lied when I said I can't read your mind. I know exactly what you really mean.