A stock split is a corporate action happening when share price increases to certain levels that are either too high or beyond the price levels of similar companies in their sector. To make the shares more affordable to a broader base of investors, the companies divide their existing shares into two or more shares while the company's underlying value has not changed.

Each share of this company's stock that an investor owns before Ex-Date will be eligible for a stock split. Investors will receive additional shares, and the stock price will be changed based on the split ratio announced by the company.

Here is an example:
If an investor owns 100 shares and the market price is $2,000, $2,100 as taking profit price. After 20 for 1 stock split, the investor will own 100*20= 2,000 shares, and the estimated post-split price would be $2,000/20 = $100. In addition, the take profit price will adjust to $2,100/20=$105.

As stated in the above example, the increased number of stocks means every share is now worth less than its previous value. Precisely, it'll be 1/20th the previous value.

To sum up, stock splits do not materially affect short sellers. Some changes occur due to a split that affects the short positions, but they don't affect the value of the short position(s).