使用receipt在OPT Extension Pending期间更换雇主

因为USCIS Texas Lockbox的延误，我刚收到receipt of my OPT extension application, 距离case approval/制卡还遥遥无期。请问我这个情况能够更换雇主么？为了赶上今年H1B抽签，我今年年初开始面试，已经拿到心仪的工作offer，但是万万没想到因为USCIS的原因迟迟不能入职。

地里有好几个帖子说使用receipt+i20就可以在opt pending期间更换雇主，我也在USCIS网站上看到了一个公告：receipt of i797 form is counted as a List C doc, 比如https://www.e-verify.gov/about-e-verify/whats-new和https://www.uscis.gov/i-9-centra ... related-to-covid-19

. From 1point 3acres bbs但是这个公告(receipt of i797 form is counted as a List C)在2021年2月1号就过期了。请问现在还可以用receipt更换雇主吗？

多谢！

具体公告内容参见页面https://www.uscis.gov/i-9-centra ... related-to-covid-19下面的Extension of Validity of Certain Forms I-797 Due to Continued Employment Authorization Document (EAD) Delays - 11/23/2020，