Call area recomputation when loading example csv

[cmalinmayor]

Proposed Change

Recompute the area in our load external csv example

Checklist

Go through these things before merge. Actions should run automatically to test them, but for information on how to run locally, see CONTRIBUTING.md.

• I have added tests that prove that my feature works in various situations or tests the bugfix (if applicable).
• I have checked that the tests pass and I maintained or improved test coverage (if applicable).
• I have written docstrings and checked that they render correctly in the documentation build.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.47%. Comparing base (b1d06cc) to head (dfb1867).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #48   +/-   ##
=======================================
  Coverage   89.47%   89.47%           
=======================================
  Files         650      650           
  Lines       60148    60148           
=======================================
  Hits        53817    53817           
  Misses       6331     6331           

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