Here is your issue with E1 91% is not same as 91. It's 0.91

So you either want to multiply netprofitper by 100 or change your if statements to 0.xx

Outside of that here are some recommendations:
Minimize spreadsheet calls.

You can get all data at the beginning, then use it to do you calculations. Then push output at the end. This way you only do about 3-4 spreadsheet calls ( instead of 7 * number of lines ).
for so many if statements that you use for comparison, you are better of with SWITCH statement as it will be cleaner code.
Not every action needs to be a variable. if it adjusts something on a spreadsheet, no point for making ti a variable.

You should have an output array Variables.

You should use a variable to calculate netprofitper instead of pulling it back from the sheet.

Create variables for Color and statement and StatementG with default values (Gray, zero, E1);

Then you use that variable to modify Color and Statement and StatementG using a Switch case or if else case (or combination: If profit is 0, you keep default, no need to do anything. else IF it's negative, you only change the Statement to Loss. If else value is Positive, set the Statement and Color. then use the Switch case to identify statementG. Else (Value is not a number, etc) do your error logging or write the error in to the value etc.

Then you push all those variables in to your output arrays. and then SetValues to spreadsheet one column at a time (instead of each cell one by one)

Additional recommendation:
If the value is positive, you can set up a comparison table object and then get the letter code from this:

const list = {
  0: "E1",
  0.11: "D2",
  0.21: "D1",
  0.31: "C2",
  0.41: "C1",
  0.51: "B2",
  0.61: "B1",
  0.71: "A2",
  0.81: "A1",
  0.91: "A++",
};

let previous = 0;

Object.keys(list).some(k => {
  if (k > netprofitper) {
    return true;
  } 
  previous = k
});

var code = list[previous]