That Boeing website you note may be referencing old data. Based on their 2019 annual report, on page 18 under item 6, Boeing cites that they had a year-end workforce of 161,100 employees. The annual report is available here: https://investors.boeing.com/investors/financial-reports/def...
> The company announced in April it would cut 10% of its worldwide workforce of 160,000 by the end of 2020.
From boeing.com:
> The company employs approximately 145,000 employees across the United States and in more than 65 countries.
90% of 160 is 144. The math checks out.