It's kind of neat to see that something like that can be done in Excel, but as usual, my reaction to anything sufficiently complex being coded in Excel is the same: Please God, not me.
It shows why Excel is so popular. You can assume that basically every company has this installed throughout the organisation. Programming it in Excel is painful but will work on any machine throughout the org. Setting this up with a web front-end may be nicer, but probably not much faster to code initially and good luck making this accessible for other departments in less than a few months.
Also, a lot of non-developers are familiar with Excel formulas and could quickly adapt the code, something impossible for most if it's written in JS or Python.
Also, a lot of non-developers are familiar with Excel formulas and could quickly adapt the code, something impossible for most if it's written in JS or Python.