Your code should look something more like this:
import arcpy
import openpyxl as px
def main():
wb = px.load_workbook(r"C:\Downloads\Ejemplo\VINCULACION.S.xlsx")
ws = wb["VINCULACION_SH_NUE"]
in_features = r"C:\Downloads\Ejemplo\VH_Dissolve.shp"
row_num = 3
with arcpy.da.SearchCursor(
in_features,
["COLOR", "INTERNO_DE", "CLASE_DEMA", "COUNT_AREA", "SUM_AREA", "SUM_LENGTH"],
) as cursor:
for row in cursor:
ws.cell(row=row_num, column=2).value = row[0]
ws.cell(row=row_num, column=3).value = row[1]
ws.cell(row=row_num, column=4).value = row[2]
ws.cell(row=row_num, column=6).value = row[3]
ws.cell(row=row_num, column=7).value = row[4]
ws.cell(row=row_num, column=8).value = row[5]
row_num += 1
wb.save(r"C:\Downloads\Ejemplo\VINCULACION_v2.xlsx")
if __name__ == "__main__":
main()
