That looks like an extremely underwhelming bit of research.
Some thoughts:
1. Figure 2 is titled "Evolutionary Tree of ancient scripts reconstructed using Neighbor Joining algorithm in ClustalW2 (Daggumati et al., 2019)", however checking the references (a) that figure does not appear in the cited paper (b) the cited paper does not use ClustalW2 (c) the scripts in the cited paper do not match those in the figure.
2. Speaking of references, they include Classen, M., & Safrany, L. (1975). Endoscopic papillotomy and removal of gall stones. This seems like an odd choice. Why did they include this? I have no idea, I can't find any cite to it in the text.
3. Immediately after "When text is rendered by a computer, the characters in the text can not all be displayed, because no font that supports them is available to the computer" they write: "The Python package Matplotlib also does not render the font as of the current version 3.3.4." I would have thought that rendering with matplotlib would have counted as "render[ing] by a computer". Please also note Figure 5, which has a screenshot of a python script and a matplotlib plot; the former displays 5 (presumed) Linear A characters correctly while the latter has only boxes. Perhaps they meant 'there is no font in which all Linear A characters are present'. (And I should point out that in less than sixty seconds of searching I discovered that--as you might expect--matplotlib can use user-specified .ttf fonts)
(Sorry I know this point is long but another thing bothering me: why bother sticking with unicode codepoints when they could have instead just assigned integers to each character?)
4. For reasons that escape me, they chose to use a word cloud in Figure 15 ("Word cloud of locations the Linear A tablets were found by the number of symbols gathered from each") instead of, for example, a table. Why is 'HT' in there at least twice? Why is 'KH' in there at least six times?
I could go on but I'll stop here and say that if I were reviewing this for a journal it would be an immediate rejection.